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UDF symlink pathComponent header OOB read

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udf_symlink_filler() can enter udf_pc_to_char() with a partial pathComponent header.

Validate that enough input remains for a complete pathComponent header
before accessing it. Reject malformed symlink data that would otherwise
make udf_pc_to_char() perform an out-of-bounds read.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: David Lee <david.lee@trailofbits.com>
Assisted-by: Codex:gpt-5.5
Link: https://patch.msgid.link/20260717104722.41446-1-david.lee@trailofbits.com
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
David Lee
2026-07-17 10:47:21 +00:00
committed by Jan Kara
parent 68d4d3e781
commit d23eb7380d
1 changed files with 2 additions and 0 deletions
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2
fs/udf/symlink.c
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@@ -36,6 +36,8 @@ static int udf_pc_to_char(struct super_block *sb, unsigned char *from,
/* Reserve one byte for terminating \0 */
tolen--;
while (elen < fromlen) {
if (fromlen - elen < sizeof(struct pathComponent))
return -EIO;
pc = (struct pathComponent *)(from + elen);
elen += sizeof(struct pathComponent);
switch (pc->componentType) {