From 0d4837fdb796f99369cf7691d33de1b856bcaf1f Mon Sep 17 00:00:00 2001
From: Zixuan Fu <r33s3n6@gmail.com>
Date: Mon Apr 11 18:45:34 2022 +0800
Subject: [PATCH] fs: jfs: fix possible NULL pointer dereference in dbFree()
Git-commit: 0d4837fdb796f99369cf7691d33de1b856bcaf1f
References: bsc#1214348 CVE-2023-4385
Patch-mainline: v5.19-rc1
In our fault-injection testing, the variable "nblocks" in dbFree() can be
zero when kmalloc_array() fails in dtSearch(). In this case, the variable
"mp" in dbFree() would be NULL and then it is dereferenced in
"write_metapage(mp)".
The failure log is listed as follows:
[ 13.824137] BUG: kernel NULL pointer dereference, address: 0000000000000020
...
[ 13.827416] RIP: 0010:dbFree+0x5f7/0x910 [jfs]
[ 13.834341] Call Trace:
[ 13.834540] <TASK>
[ 13.834713] txFreeMap+0x7b4/0xb10 [jfs]
[ 13.835038] txUpdateMap+0x311/0x650 [jfs]
[ 13.835375] jfs_lazycommit+0x5f2/0xc70 [jfs]
[ 13.835726] ? sched_dynamic_update+0x1b0/0x1b0
[ 13.836092] kthread+0x3c2/0x4a0
[ 13.836355] ? txLockFree+0x160/0x160 [jfs]
[ 13.836763] ? kthread_unuse_mm+0x160/0x160
[ 13.837106] ret_from_fork+0x1f/0x30
[ 13.837402] </TASK>
...
This patch adds a NULL check of "mp" before "write_metapage(mp)" is called.
Reported-by: TOTE Robot <oslab@tsinghua.edu.cn>
Signed-off-by: Zixuan Fu <r33s3n6@gmail.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Acked-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c
index d8502f4..e75f31b 100644
--- a/fs/jfs/jfs_dmap.c
+++ b/fs/jfs/jfs_dmap.c
@@ -385,7 +385,8 @@ int dbFree(struct inode *ip, s64 blkno, s64 nblocks)
}
/* write the last buffer. */
- write_metapage(mp);
+ if (mp)
+ write_metapage(mp);
IREAD_UNLOCK(ipbmap);