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Fixes made in response to running a static code analyzer under MS Windows. 

Most of these are probably harmless, but the changes to SDL_immdevice.c and SDL_pixels.c appear to have fixed genuine bugs.

SDL_audiocvt.c: By separating the calculation of the divisor, I got rid of the suspicion that dividing a double by an integer led to loss of precision.
SDL_immdevice.c: Added a missing test, one that could have otherwise led to dereferencing a null pointer.
SDL_events.c, SDL_gamecontroller.c, SDL_joystick.c, SDL_malloc.c, SDL_video.c: Made it clear the return values weren't used.
SDL_hidapi_shield.c: The size is zero, so nothing bad would have happened, but the SDL_memset() was still being given an address outside of the array's range.
SDL_dinputjoystick.c: Initialize local data, just in case IDirectInputDevice8_GetProperty() isn't guaranteed to write to it.
SDL_render_sw.c: drawstate.viewport could be null (as seen on line 691).
SDL.c: SDL_MostSignificantBitIndex32() could return -1, though I don't know if you want to cope with that (what I did) or SDL_assert() that it can't happen.
SDL_hints.c: Replaced boolean tests on pointer values with comparisons to NULL.
SDL_pixels.c: Looks like the switch is genuinely missing a break!
SDL_rect_impl.h: The MacOS static checker pointed out issues with the X comparisons that were handled by assertions; I added assertions for the Y comparisons.
SDL_yuv.c, SDL_windowskeyboard.c, SDL_windowswindow.c: Checked error-result returns.
This commit is contained in:
ulatekh 2022-10-05 19:26:09 -07:00 committed by Ryan C. Gordon
parent 7ebdae5dc9
commit ec58a817ef
17 changed files with 63 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
src/SDL.c
View File

@ -125,8 +125,9 @@ static void
SDL_PrivateSubsystemRefCountIncr(Uint32 subsystem)
{
int subsystem_index = SDL_MostSignificantBitIndex32(subsystem);
SDL_assert(SDL_SubsystemRefCount[subsystem_index] < 255);
++SDL_SubsystemRefCount[subsystem_index];
SDL_assert(subsystem_index < 0 || SDL_SubsystemRefCount[subsystem_index] < 255);
if (subsystem_index >= 0)
++SDL_SubsystemRefCount[subsystem_index];
}
/* Private helper to decrement a subsystem's ref counter. */
@ -134,7 +135,7 @@ static void
SDL_PrivateSubsystemRefCountDecr(Uint32 subsystem)
{
int subsystem_index = SDL_MostSignificantBitIndex32(subsystem);
if (SDL_SubsystemRefCount[subsystem_index] > 0) {
if (subsystem_index >= 0 && SDL_SubsystemRefCount[subsystem_index] > 0) {
--SDL_SubsystemRefCount[subsystem_index];
}
}
@ -144,22 +145,22 @@ static SDL_bool
SDL_PrivateShouldInitSubsystem(Uint32 subsystem)
{
int subsystem_index = SDL_MostSignificantBitIndex32(subsystem);
SDL_assert(SDL_SubsystemRefCount[subsystem_index] < 255);
return (SDL_SubsystemRefCount[subsystem_index] == 0) ? SDL_TRUE : SDL_FALSE;
SDL_assert(subsystem_index < 0 || SDL_SubsystemRefCount[subsystem_index] < 255);
return (subsystem_index >= 0 && SDL_SubsystemRefCount[subsystem_index] == 0) ? SDL_TRUE : SDL_FALSE;
}
/* Private helper to check if a system needs to be quit. */
static SDL_bool
SDL_PrivateShouldQuitSubsystem(Uint32 subsystem) {
int subsystem_index = SDL_MostSignificantBitIndex32(subsystem);
if (SDL_SubsystemRefCount[subsystem_index] == 0) {
if (subsystem_index >= 0 && SDL_SubsystemRefCount[subsystem_index] == 0) {
return SDL_FALSE;
}
/* If we're in SDL_Quit, we shut down every subsystem, even if refcount
* isn't zero.
*/
return (SDL_SubsystemRefCount[subsystem_index] == 1 || SDL_bInMainQuit) ? SDL_TRUE : SDL_FALSE;
return ((subsystem_index >= 0 && SDL_SubsystemRefCount[subsystem_index] == 1) || SDL_bInMainQuit) ? SDL_TRUE : SDL_FALSE;
}
void

6
src/SDL_hints.c
View File

@ -112,7 +112,7 @@ SDL_ResetHint(const char *name)
if (SDL_strcmp(name, hint->name) == 0) {
if ((env == NULL && hint->value != NULL) ||
(env != NULL && hint->value == NULL) ||
(env && SDL_strcmp(env, hint->value) != 0)) {
(env != NULL && SDL_strcmp(env, hint->value) != 0)) {
for (entry = hint->callbacks; entry; ) {
/* Save the next entry in case this one is deleted */
SDL_HintWatch *next = entry->next;
@ -140,7 +140,7 @@ SDL_ResetHints(void)
env = SDL_getenv(hint->name);
if ((env == NULL && hint->value != NULL) ||
(env != NULL && hint->value == NULL) ||
(env && SDL_strcmp(env, hint->value) != 0)) {
(env != NULL && SDL_strcmp(env, hint->value) != 0)) {
for (entry = hint->callbacks; entry; ) {
/* Save the next entry in case this one is deleted */
SDL_HintWatch *next = entry->next;
@ -169,7 +169,7 @@ SDL_GetHint(const char *name)
env = SDL_getenv(name);
for (hint = SDL_hints; hint; hint = hint->next) {
if (SDL_strcmp(name, hint->name) == 0) {
if (!env || hint->priority == SDL_HINT_OVERRIDE) {
if (env == NULL || hint->priority == SDL_HINT_OVERRIDE) {
return hint->value;
}
break;

3
src/audio/SDL_audiocvt.c
View File

@ -403,7 +403,8 @@ SDL_BuildAudioTypeCVTFromFloat(SDL_AudioCVT *cvt, const SDL_AudioFormat dst_fmt)
cvt->len_mult *= mult;
cvt->len_ratio *= mult;
} else if (src_bitsize > dst_bitsize) {
cvt->len_ratio /= (src_bitsize / dst_bitsize);
const int div = (src_bitsize / dst_bitsize);
cvt->len_ratio /= div;
}
retval = 1; /* added a converter. */
}

4
src/core/windows/SDL_immdevice.c
View File

@ -399,7 +399,9 @@ static int SDLCALL sort_endpoints(const void *_a, const void *_b)
{
LPWSTR a = ((const EndpointItem *)_a)->devid;
LPWSTR b = ((const EndpointItem *)_b)->devid;
if (!a && b) {
if (!a && !b) {
return 0;
} else if (!a && b) {
return -1;
} else if (a && !b) {
return 1;

12
src/events/SDL_events.c
View File

@ -147,7 +147,7 @@ SDL_AutoUpdateSensorsChanged(void *userdata, const char *name, const char *oldVa
static void SDLCALL
SDL_PollSentinelChanged(void *userdata, const char *name, const char *oldValue, const char *hint)
{
SDL_EventState(SDL_POLLSENTINEL, SDL_GetStringBoolean(hint, SDL_TRUE) ? SDL_ENABLE : SDL_DISABLE);
(void)SDL_EventState(SDL_POLLSENTINEL, SDL_GetStringBoolean(hint, SDL_TRUE) ? SDL_ENABLE : SDL_DISABLE);
}
/**
@ -566,12 +566,12 @@ SDL_StartEventLoop(void)
#endif /* !SDL_THREADS_DISABLED */
/* Process most event types */
SDL_EventState(SDL_TEXTINPUT, SDL_DISABLE);
SDL_EventState(SDL_TEXTEDITING, SDL_DISABLE);
SDL_EventState(SDL_SYSWMEVENT, SDL_DISABLE);
(void)SDL_EventState(SDL_TEXTINPUT, SDL_DISABLE);
(void)SDL_EventState(SDL_TEXTEDITING, SDL_DISABLE);
(void)SDL_EventState(SDL_SYSWMEVENT, SDL_DISABLE);
#if 0 /* Leave these events enabled so apps can respond to items being dragged onto them at startup */
SDL_EventState(SDL_DROPFILE, SDL_DISABLE);
SDL_EventState(SDL_DROPTEXT, SDL_DISABLE);
(void)SDL_EventState(SDL_DROPFILE, SDL_DISABLE);
(void)SDL_EventState(SDL_DROPTEXT, SDL_DISABLE);
#endif
SDL_EventQ.active = SDL_TRUE;

2
src/joystick/SDL_gamecontroller.c
View File

@ -3009,7 +3009,7 @@ SDL_GameControllerEventState(int state)
break;
default:
for (i = 0; i < SDL_arraysize(event_list); ++i) {
SDL_EventState(event_list[i], state);
(void)SDL_EventState(event_list[i], state);
}
break;
}

2
src/joystick/SDL_joystick.c
View File

@ -1798,7 +1798,7 @@ SDL_JoystickEventState(int state)
break;
default:
for (i = 0; i < SDL_arraysize(event_list); ++i) {
SDL_EventState(event_list[i], state);
(void)SDL_EventState(event_list[i], state);
}
break;
}

3
src/joystick/hidapi/SDL_hidapi_shield.c
View File

@ -169,7 +169,8 @@ HIDAPI_DriverShield_SendCommand(SDL_HIDAPI_Device *device, Uint8 cmd, const void
}
/* Zero unused data in the payload */
SDL_memset(&cmd_pkt.payload[size], 0, sizeof(cmd_pkt.payload) - size);
if (size != sizeof(cmd_pkt.payload))
SDL_memset(&cmd_pkt.payload[size], 0, sizeof(cmd_pkt.payload) - size);
if (SDL_HIDAPI_SendRumbleAndUnlock(device, (Uint8*)&cmd_pkt, sizeof(cmd_pkt)) != sizeof(cmd_pkt)) {
return SDL_SetError("Couldn't send command packet");

1
src/joystick/windows/SDL_dinputjoystick.c
View File

@ -329,6 +329,7 @@ QueryDeviceInfo(LPDIRECTINPUTDEVICE8 device, Uint16* vendor_id, Uint16* product_
dipdw.diph.dwHeaderSize = sizeof(dipdw.diph);
dipdw.diph.dwObj = 0;
dipdw.diph.dwHow = DIPH_DEVICE;
dipdw.dwData = 0;
if (FAILED(IDirectInputDevice8_GetProperty(device, DIPROP_VIDPID, &dipdw.diph))) {
return SDL_FALSE;

14
src/render/software/SDL_render_sw.c
View File

@ -733,7 +733,7 @@ SW_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *vertic
SetDrawState(surface, &drawstate);
/* Apply viewport */
if (drawstate.viewport->x || drawstate.viewport->y) {
if (drawstate.viewport != NULL && (drawstate.viewport->x || drawstate.viewport->y)) {
int i;
for (i = 0; i < count; i++) {
verts[i].x += drawstate.viewport->x;
@ -760,7 +760,7 @@ SW_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *vertic
SetDrawState(surface, &drawstate);
/* Apply viewport */
if (drawstate.viewport->x || drawstate.viewport->y) {
if (drawstate.viewport != NULL && (drawstate.viewport->x || drawstate.viewport->y)) {
int i;
for (i = 0; i < count; i++) {
verts[i].x += drawstate.viewport->x;
@ -787,7 +787,7 @@ SW_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *vertic
SetDrawState(surface, &drawstate);
/* Apply viewport */
if (drawstate.viewport->x || drawstate.viewport->y) {
if (drawstate.viewport != NULL && (drawstate.viewport->x || drawstate.viewport->y)) {
int i;
for (i = 0; i < count; i++) {
verts[i].x += drawstate.viewport->x;
@ -815,7 +815,7 @@ SW_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *vertic
PrepTextureForCopy(cmd);
/* Apply viewport */
if (drawstate.viewport->x || drawstate.viewport->y) {
if (drawstate.viewport != NULL && (drawstate.viewport->x || drawstate.viewport->y)) {
dstrect->x += drawstate.viewport->x;
dstrect->y += drawstate.viewport->y;
}
@ -873,7 +873,7 @@ SW_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *vertic
PrepTextureForCopy(cmd);
/* Apply viewport */
if (drawstate.viewport->x || drawstate.viewport->y) {
if (drawstate.viewport != NULL && (drawstate.viewport->x || drawstate.viewport->y)) {
copydata->dstrect.x += drawstate.viewport->x;
copydata->dstrect.y += drawstate.viewport->y;
}
@ -901,7 +901,7 @@ SW_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *vertic
PrepTextureForCopy(cmd);
/* Apply viewport */
if (drawstate.viewport->x || drawstate.viewport->y) {
if (drawstate.viewport != NULL && (drawstate.viewport->x || drawstate.viewport->y)) {
SDL_Point vp;
vp.x = drawstate.viewport->x;
vp.y = drawstate.viewport->y;
@ -924,7 +924,7 @@ SW_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *vertic
GeometryFillData *ptr = (GeometryFillData *) verts;
/* Apply viewport */
if (drawstate.viewport->x || drawstate.viewport->y) {
if (drawstate.viewport != NULL && (drawstate.viewport->x || drawstate.viewport->y)) {
SDL_Point vp;
vp.x = drawstate.viewport->x;
vp.y = drawstate.viewport->y;

2
src/stdlib/SDL_malloc.c
View File

@ -2580,7 +2580,7 @@ init_mparams(void)
#else /* (FOOTERS && !INSECURE) */
s = (size_t) 0x58585858U;
#endif /* (FOOTERS && !INSECURE) */
ACQUIRE_MAGIC_INIT_LOCK();
(void)ACQUIRE_MAGIC_INIT_LOCK();
if (mparams.magic == 0) {
mparams.magic = s;
/* Set up lock for main malloc area */

1
src/video/SDL_pixels.c
View File

@ -436,6 +436,7 @@ SDL_MasksToPixelFormatEnum(int bpp, Uint32 Rmask, Uint32 Gmask, Uint32 Bmask,
return SDL_PIXELFORMAT_RGB24;
#endif
}
break;
case 32:
if (Rmask == 0) {
return SDL_PIXELFORMAT_RGB888;

2
src/video/SDL_rect_impl.h
View File

@ -400,9 +400,11 @@ SDL_INTERSECTRECTANDLINE(const RECTTYPE * rect, SCALARTYPE *X1, SCALARTYPE *Y1,
outcode1 = COMPUTEOUTCODE(rect, x, y);
} else {
if (outcode2 & CODE_TOP) {
SDL_assert(y2 != y1); /* if equal: division by zero. */
y = recty1;
x = x1 + ((x2 - x1) * (y - y1)) / (y2 - y1);
} else if (outcode2 & CODE_BOTTOM) {
SDL_assert(y2 != y1); /* if equal: division by zero. */
y = recty2;
x = x1 + ((x2 - x1) * (y - y1)) / (y2 - y1);
} else if (outcode2 & CODE_LEFT) {

8
src/video/SDL_video.c
View File

@ -4337,8 +4337,8 @@ SDL_StartTextInput(void)
SDL_Window *window;
/* First, enable text events */
SDL_EventState(SDL_TEXTINPUT, SDL_ENABLE);
SDL_EventState(SDL_TEXTEDITING, SDL_ENABLE);
(void)SDL_EventState(SDL_TEXTINPUT, SDL_ENABLE);
(void)SDL_EventState(SDL_TEXTEDITING, SDL_ENABLE);
/* Then show the on-screen keyboard, if any */
window = SDL_GetFocusWindow();
@ -4393,8 +4393,8 @@ SDL_StopTextInput(void)
}
/* Finally disable text events */
SDL_EventState(SDL_TEXTINPUT, SDL_DISABLE);
SDL_EventState(SDL_TEXTEDITING, SDL_DISABLE);
(void)SDL_EventState(SDL_TEXTINPUT, SDL_DISABLE);
(void)SDL_EventState(SDL_TEXTEDITING, SDL_DISABLE);
}
void

7
src/video/SDL_yuv.c
View File

@ -601,9 +601,10 @@ SDL_ConvertPixels_ARGB8888_to_YUV(int width, int height, const void *src, int sr
Uint8 *plane_interleaved_uv;
Uint32 y_stride, uv_stride, y_skip, uv_skip;
GetYUVPlanes(width, height, dst_format, dst, dst_pitch,
(const Uint8 **)&plane_y, (const Uint8 **)&plane_u, (const Uint8 **)&plane_v,
&y_stride, &uv_stride);
if (GetYUVPlanes(width, height, dst_format, dst, dst_pitch,
(const Uint8 **)&plane_y, (const Uint8 **)&plane_u, (const Uint8 **)&plane_v,
&y_stride, &uv_stride) != 0)
return -1;
plane_interleaved_uv = (plane_y + height * y_stride);
y_skip = (y_stride - width);

10
src/video/windows/SDL_windowskeyboard.c
View File

@ -389,13 +389,21 @@ WIN_ShouldShowNativeUI()
static void
IME_Init(SDL_VideoData *videodata, HWND hwnd)
{
HRESULT hResult = S_OK;
if (videodata->ime_initialized)
return;
videodata->ime_hwnd_main = hwnd;
if (SUCCEEDED(WIN_CoInitialize())) {
videodata->ime_com_initialized = SDL_TRUE;
CoCreateInstance(&CLSID_TF_ThreadMgr, NULL, CLSCTX_INPROC_SERVER, &IID_ITfThreadMgr, (LPVOID *)&videodata->ime_threadmgr);
hResult = CoCreateInstance(&CLSID_TF_ThreadMgr, NULL, CLSCTX_INPROC_SERVER, &IID_ITfThreadMgr, (LPVOID *)&videodata->ime_threadmgr);
if (hResult != S_OK)
{
videodata->ime_available = SDL_FALSE;
SDL_SetError("CoCreateInstance() failed, HRESULT is %08X", (unsigned int)hResult);
return;
}
}
videodata->ime_initialized = SDL_TRUE;
videodata->ime_himm32 = SDL_LoadObject("imm32.dll");

12
src/video/windows/SDL_windowswindow.c
View File

@ -739,15 +739,18 @@ WIN_GetWindowBordersSize(_THIS, SDL_Window * window, int *top, int *left, int *b
/* rcClient stores the size of the inner window, while rcWindow stores the outer size relative to the top-left
* screen position; so the top/left values of rcClient are always {0,0} and bottom/right are {height,width} */
GetClientRect(hwnd, &rcClient);
GetWindowRect(hwnd, &rcWindow);
if (!GetClientRect(hwnd, &rcClient))
SDL_SetError("GetClientRect() failed, error %08X", (unsigned int)GetLastError());
if (!GetWindowRect(hwnd, &rcWindow))
SDL_SetError("GetWindowRect() failed, error %08X", (unsigned int)GetLastError());
/* convert the top/left values to make them relative to
* the window; they will end up being slightly negative */
ptDiff.y = rcWindow.top;
ptDiff.x = rcWindow.left;
ScreenToClient(hwnd, &ptDiff);
if (!ScreenToClient(hwnd, &ptDiff))
SDL_SetError("ScreenToClient() failed, error %08X", (unsigned int)GetLastError());
rcWindow.top = ptDiff.y;
rcWindow.left = ptDiff.x;
@ -757,7 +760,8 @@ WIN_GetWindowBordersSize(_THIS, SDL_Window * window, int *top, int *left, int *b
ptDiff.y = rcWindow.bottom;
ptDiff.x = rcWindow.right;
ScreenToClient(hwnd, &ptDiff);
if (!ScreenToClient(hwnd, &ptDiff))
SDL_SetError("ScreenToClient() failed, error %08X", (unsigned int)GetLastError());
rcWindow.bottom = ptDiff.y;
rcWindow.right = ptDiff.x;