From be3f9dd26cf59cadc21e4d5cc27dd199c9752b1c Mon Sep 17 00:00:00 2001 From: =?utf8?q?Jos=C3=A9=20Fonseca?= Date: Thu, 30 Apr 2009 13:10:58 +0100 Subject: [PATCH] util: Limit the stack walk to avoid referencing undefined memory. --- src/gallium/auxiliary/util/u_debug_stack.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/src/gallium/auxiliary/util/u_debug_stack.c b/src/gallium/auxiliary/util/u_debug_stack.c index e9891fde8a3..528a1c394be 100644 --- a/src/gallium/auxiliary/util/u_debug_stack.c +++ b/src/gallium/auxiliary/util/u_debug_stack.c @@ -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 -- 2.30.2