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* [binutils-gdb] asan: NULL dereference in som_set_reloc_info
@ 2022-08-13 6:52 Alan Modra
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From: Alan Modra @ 2022-08-13 6:52 UTC (permalink / raw)
To: bfd-cvs
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=8c68d88cc44ec476125e30835f79865e8eb32358
commit 8c68d88cc44ec476125e30835f79865e8eb32358
Author: Alan Modra <amodra@gmail.com>
Date: Sat Aug 13 14:05:24 2022 +0930
asan: NULL dereference in som_set_reloc_info
* som.c (som_set_reloc_info): Ignore non-existent previous
fixup references.
Diff:
---
bfd/som.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/bfd/som.c b/bfd/som.c
index d33ad67561a..c22f13b5a4c 100644
--- a/bfd/som.c
+++ b/bfd/som.c
@@ -4978,6 +4978,11 @@ som_set_reloc_info (unsigned char *fixup,
/* Handle a request for a previous fixup. */
if (*fp->format == 'P')
{
+ if (!reloc_queue[fp->D].reloc)
+ /* The back-reference doesn't exist. This is a broken
+ object file, likely fuzzed. Just ignore the fixup. */
+ continue;
+
/* Get pointer to the beginning of the prev fixup, move
the repeated fixup to the head of the queue. */
fixup = reloc_queue[fp->D].reloc;
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