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util: Limit the stack walk to avoid referencing undefined memory.

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This commit is contained in:
José Fonseca 2009-04-30 13:10:58 +01:00 • committed by Keith Whitwell
parent b865501bda
commit 3537c3420d
1 changed files with 10 additions and 1 deletions
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11
src/gallium/auxiliary/util/u_debug_stack.c
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@ -62,6 +62,8 @@ debug_backtrace_capture(struct debug_stack_frame *backtrace,
#ifdef PIPE_ARCH_X86
while(nr_frames) {
const void **next_frame_pointer;
if(!frame_pointer)
break;
@ -72,7 +74,14 @@ debug_backtrace_capture(struct debug_stack_frame *backtrace,
--nr_frames;
}
frame_pointer = (const void **)frame_pointer[0];
next_frame_pointer = (const void **)frame_pointer[0];
/* Limit the stack walk to avoid referencing undefined memory */
if((uintptr_t)next_frame_pointer <= (uintptr_t)frame_pointer ||
(uintptr_t)next_frame_pointer > (uintptr_t)frame_pointer + 64*1024)
break;
frame_pointer = next_frame_pointer;
}
#endif