When the value of lp is 1 at the end of the iteration in the for loop, lp is modified in the next iteration to a negative value. Add a check to prevent this condition.
Reported-by: [email protected] Closes: https://syzkaller.appspot.com/bug?extid=412dea214d8baa3f7483 Tested-by: [email protected] Signed-off-by: Nihar Chaithanya <[email protected]> --- fs/jfs/jfs_dmap.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c index 5713994328cb..3ebb2dfdd0b3 100644 --- a/fs/jfs/jfs_dmap.c +++ b/fs/jfs/jfs_dmap.c @@ -2911,6 +2911,12 @@ static void dbAdjTree(dmtree_t *tp, int leafno, int newval, bool is_ctl) */ tp->dmt_stree[pp] = max; + /* check to prevent negative value of lp on the + * next iteration. + */ + if (lp == 1) + break; + /* parent becomes leaf for next go-round. */ lp = pp; -- 2.34.1
