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mesa: fix NULL pointer deref bug in _mesa_drawbuffers()

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This is a follow-on fix to commit 39b40ad144.  Fixes a crash if the
user calls glDrawBuffers(0, NULL).

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=82814
Cc: "10.2" <mesa-stable@lists.freedesktop.org>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
This commit is contained in:
Brian Paul 2014-08-19 07:51:07 -06:00
parent dfa10ed264
commit 31ce84a81f
1 changed files with 1 additions and 1 deletions
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2
src/mesa/main/buffers.c
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@ -498,7 +498,7 @@ _mesa_drawbuffers(struct gl_context *ctx, GLuint n, const GLenum *buffers,
* (ex: glDrawBuffer(GL_FRONT_AND_BACK)).
* Otherwise, destMask[x] can only have one bit set.
*/
if (_mesa_bitcount(destMask[0]) > 1) {
if (n > 0 && _mesa_bitcount(destMask[0]) > 1) {
GLuint count = 0, destMask0 = destMask[0];
while (destMask0) {
GLint bufIndex = ffs(destMask0) - 1;