From: Pavel Skripkin paskripkin@gmail.com
commit 9d574f985fe33efd6911f4d752de6f485a1ea732 upstream.
Avoid passing inode with JFS_SBI(inode->i_sb)->ipimap == NULL to diFree()[1]. GFP will appear:
struct inode *ipimap = JFS_SBI(ip->i_sb)->ipimap; struct inomap *imap = JFS_IP(ipimap)->i_imap;
JFS_IP() will return invalid pointer when ipimap == NULL
Call Trace: diFree+0x13d/0x2dc0 fs/jfs/jfs_imap.c:853 [1] jfs_evict_inode+0x2c9/0x370 fs/jfs/inode.c:154 evict+0x2ed/0x750 fs/inode.c:578 iput_final fs/inode.c:1654 [inline] iput.part.0+0x3fe/0x820 fs/inode.c:1680 iput+0x58/0x70 fs/inode.c:1670
Reported-and-tested-by: syzbot+0a89a7b56db04c21a656@syzkaller.appspotmail.com Signed-off-by: Pavel Skripkin paskripkin@gmail.com Signed-off-by: Dave Kleikamp dave.kleikamp@oracle.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/jfs/inode.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/fs/jfs/inode.c +++ b/fs/jfs/inode.c @@ -151,7 +151,8 @@ void jfs_evict_inode(struct inode *inode if (test_cflag(COMMIT_Freewmap, inode)) jfs_free_zero_link(inode);
- diFree(inode); + if (JFS_SBI(inode->i_sb)->ipimap) + diFree(inode);
/* * Free the inode from the quota allocation.