[PATCH AUTOSEL 5.15 05/13] jfs: fix uaf in jfs_evict_inode

From: Sasha Levin
Date: Mon Jan 15 2024 - 19:59:32 EST


From: Edward Adam Davis <eadavis@xxxxxx>

[ Upstream commit e0e1958f4c365e380b17ccb35617345b31ef7bf3 ]

When the execution of diMount(ipimap) fails, the object ipimap that has been
released may be accessed in diFreeSpecial(). Asynchronous ipimap release occurs
when rcu_core() calls jfs_free_node().

Therefore, when diMount(ipimap) fails, sbi->ipimap should not be initialized as
ipimap.

Reported-and-tested-by: syzbot+01cf2dbcbe2022454388@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Edward Adam Davis <eadavis@xxxxxx>
Signed-off-by: Dave Kleikamp <dave.kleikamp@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
fs/jfs/jfs_mount.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/jfs/jfs_mount.c b/fs/jfs/jfs_mount.c
index aa4ff7bcaff2..55702b31ab3c 100644
--- a/fs/jfs/jfs_mount.c
+++ b/fs/jfs/jfs_mount.c
@@ -172,15 +172,15 @@ int jfs_mount(struct super_block *sb)
}
jfs_info("jfs_mount: ipimap:0x%p", ipimap);

- /* map further access of per fileset inodes by the fileset inode */
- sbi->ipimap = ipimap;
-
/* initialize fileset inode allocation map */
if ((rc = diMount(ipimap))) {
jfs_err("jfs_mount: diMount failed w/rc = %d", rc);
goto err_ipimap;
}

+ /* map further access of per fileset inodes by the fileset inode */
+ sbi->ipimap = ipimap;
+
return rc;

/*
--
2.43.0