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swrast: Fix unsigned promotion in pointer arithmetic 

When rowstride was negatie, unsigned promotion caused a segfault here:

299│    if (rb->Format == MESA_FORMAT_S8) {
300│       const GLuint rowStride = rb->RowStride;
301│       for (i = 0; i < count; i++) {
302│          if (x[i] >= 0 && y[i] >= 0 && x[i] < w && y[i] < h) {
303├>            stencil[i] = *(map + y[i] * rowStride + x[i]);
304│          }
305│       }
306│    }

Fixes segfault in oglconform
separatestencil-neu(NonPolygon.BothFacesBitmapCoreAPI),
though test still fails.

Note: This is a candidate for the stable branches.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=43327
Reviewed-by: Brian Paul <brianp@vmware.com>
Signed-off-by: Chad Versace <chad.versace@linux.intel.com>
This commit is contained in:
Chad Versace 2012-01-18 15:56:58 -08:00
parent b48d4b64e9
commit aed5c8299f
1 changed files with 3 additions and 3 deletions
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6
src/mesa/swrast/s_stencil.c
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@ -297,7 +297,7 @@ get_s8_values(struct gl_context *ctx, struct gl_renderbuffer *rb,
GLuint i;
if (rb->Format == MESA_FORMAT_S8) {
const GLuint rowStride = rb->RowStride;
const GLint rowStride = rb->RowStride;
for (i = 0; i < count; i++) {
if (x[i] >= 0 && y[i] >= 0 && x[i] < w && y[i] < h) {
stencil[i] = *(map + y[i] * rowStride + x[i]);
@ -305,8 +305,8 @@ get_s8_values(struct gl_context *ctx, struct gl_renderbuffer *rb,
}
}
else {
const GLuint bpp = _mesa_get_format_bytes(rb->Format);
const GLuint rowStride = rb->RowStride * bpp;
const GLint bpp = _mesa_get_format_bytes(rb->Format);
const GLint rowStride = rb->RowStride * bpp;
for (i = 0; i < count; i++) {
if (x[i] >= 0 && y[i] >= 0 && x[i] < w && y[i] < h) {
const GLubyte *src = map + y[i] * rowStride + x[i] * bpp;