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jfs: array-index-out-of-bounds fix in dtReadFirst

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The value of stbl can be sometimes out of bounds due
to a bad filesystem. Added a check with appopriate return
of error code in that case.

Reported-by: syzbot+65fa06e29859e41a83f3@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=65fa06e29859e41a83f3
Signed-off-by: Ghanshyam Agrawal <ghanshyam1898@gmail.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
This commit is contained in:
Ghanshyam Agrawal 2024-09-28 14:07:22 +05:30 committed by Dave Kleikamp
parent e42b1a9a25
commit ca84a2c9be
1 changed files with 7 additions and 0 deletions
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7
fs/jfs/jfs_dtree.c
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@ -3086,6 +3086,13 @@ static int dtReadFirst(struct inode *ip, struct btstack * btstack)
/* get the leftmost entry */
stbl = DT_GETSTBL(p);
if (stbl[0] < 0 || stbl[0] > 127) {
DT_PUTPAGE(mp);
jfs_error(ip->i_sb, "stbl[0] out of bound\n");
return -EIO;
}
xd = (pxd_t *) & p->slot[stbl[0]];
/* get the child page block address */