[PATCH AUTOSEL 4.19 35/39] jfs: fix GPF in diFree
From: Sasha Levin <sashal@kernel.org>
Date: 2021-07-10 02:39:15
Also in:
lkml
Subsystem:
filesystems (vfs and infrastructure), jfs filesystem, the rest · Maintainers:
Alexander Viro, Christian Brauner, Dave Kleikamp, Linus Torvalds
From: Pavel Skripkin <redacted> [ Upstream commit 9d574f985fe33efd6911f4d752de6f485a1ea732 ] 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 <redacted> Signed-off-by: Dave Kleikamp <redacted> Signed-off-by: Sasha Levin <sashal@kernel.org> --- fs/jfs/inode.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/jfs/inode.c b/fs/jfs/inode.c
index 054cc761b426..87b41edc800d 100644
--- a/fs/jfs/inode.c
+++ b/fs/jfs/inode.c@@ -161,7 +161,8 @@ 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.
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2.30.2