This is a note to let you know that I've just added the patch titled
jfs: add a check to prevent array-index-out-of-bounds in dbAdjTree
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
jfs-add-a-check-to-prevent-array-index-out-of-bounds.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit f8f412f9b27069aa018be675c90a8977c08c34bb
Author: Nihar Chaithanya <niharchaithanya@xxxxxxxxx>
Date: Wed Oct 9 01:51:38 2024 +0530
jfs: add a check to prevent array-index-out-of-bounds in dbAdjTree
[ Upstream commit a174706ba4dad895c40b1d2277bade16dfacdcd9 ]
When the value of lp is 0 at the beginning of the for loop, it will
become negative in the next assignment and we should bail out.
Reported-by: syzbot+412dea214d8baa3f7483@xxxxxxxxxxxxxxxxxxxxxxxxx
Closes: https://syzkaller.appspot.com/bug?extid=412dea214d8baa3f7483
Tested-by: syzbot+412dea214d8baa3f7483@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Nihar Chaithanya <niharchaithanya@xxxxxxxxx>
Signed-off-by: Dave Kleikamp <dave.kleikamp@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c
index d83ac5f5888a4..812945c8e3840 100644
--- a/fs/jfs/jfs_dmap.c
+++ b/fs/jfs/jfs_dmap.c
@@ -2953,6 +2953,9 @@ static void dbAdjTree(dmtree_t *tp, int leafno, int newval, bool is_ctl)
/* bubble the new value up the tree as required.
*/
for (k = 0; k < le32_to_cpu(tp->dmt_height); k++) {
+ if (lp == 0)
+ break;
+
/* get the index of the first leaf of the 4 leaf
* group containing the specified leaf (leafno).
*/
