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jfs: add a check to prevent array-index-out-of-bounds in dbAdjTree

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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@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=412dea214d8baa3f7483
Tested-by: syzbot+412dea214d8baa3f7483@syzkaller.appspotmail.com
Signed-off-by: Nihar Chaithanya <niharchaithanya@gmail.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
This commit is contained in:
Nihar Chaithanya 2024-10-09 01:51:38 +05:30 committed by Dave Kleikamp
parent d9f9d96136
commit a174706ba4
1 changed files with 3 additions and 0 deletions
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3
fs/jfs/jfs_dmap.c
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@ -2891,6 +2891,9 @@ 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).
*/