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glx: Check that swap_buffers_reply is non-NULL before using it

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Check that the return value from xcb_dri2_swap_buffers_reply is
non-NULL before accessing the struct members.

Note: This is a candidate for the 9.0 branch.

Reviewed-by: Brian Paul <brianp@vmware.com>
(cherry picked from commit 67e7263e45)
This commit is contained in:
Stéphane Marchesin 2013-01-28 15:04:00 -08:00 • committed by Ian Romanick
parent c7e5e9ddce
commit b289e639e4
1 changed files with 5 additions and 3 deletions
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8
src/glx/dri2_glx.c
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@ -789,9 +789,11 @@ dri2XcbSwapBuffers(Display *dpy,
swap_buffers_reply =
xcb_dri2_swap_buffers_reply(c, swap_buffers_cookie, NULL);
ret = merge_counter(swap_buffers_reply->swap_hi,
swap_buffers_reply->swap_lo);
free(swap_buffers_reply);
if (swap_buffers_reply) {
ret = merge_counter(swap_buffers_reply->swap_hi,
swap_buffers_reply->swap_lo);
free(swap_buffers_reply);
}
return ret;
}