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Fix crash when clearing surface memory

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The beginning of the surface data needs to be computed correctly if the
stride is negative, otherwise, it should point already to the beginning
of the surface data. This bug seems to exists since 4a208b (0.5.2)

https://bugzilla.redhat.com/show_bug.cgi?id=1029646
This commit is contained in:
Marc-André Lureau 2014-08-06 18:34:56 +02:00
parent 3c25192ee9
commit 1898f3949c
1 changed files with 5 additions and 1 deletions
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6
server/red_worker.c
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@ -9470,7 +9470,11 @@ static inline void red_create_surface(RedWorker *worker, uint32_t surface_id, ui
surface->context.stride = stride;
surface->context.line_0 = line_0;
if (!data_is_valid) {
memset((char *)line_0 + (int32_t)(stride * (height - 1)), 0, height*abs(stride));
char *data = line_0;
if (stride < 0) {
data -= abs(stride) * (height - 1);
}
memset(data, 0, height*abs(stride));
}
surface->create.info = NULL;
surface->destroy.info = NULL;