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| author | Edward Adam Davis <eadavis@qq.com> | 2025-02-20 14:24:19 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-04-20 11:15:19 +0300 |
| commit | ccd97c8a4f90810f228ee40d1055148fa146dd57 (patch) | |
| tree | db8e9948962ccca9a69be29376682d435bededd9 | |
| parent | aeb926e605f97857504bdf748f575e40617e2ef9 (diff) | |
| download | linux-ccd97c8a4f90810f228ee40d1055148fa146dd57.tar.xz | |
jfs: add sanity check for agwidth in dbMount
[ Upstream commit ddf2846f22e8575d6b4b6a66f2100f168b8cd73d ]
The width in dmapctl of the AG is zero, it trigger a divide error when
calculating the control page level in dbAllocAG.
To avoid this issue, add a check for agwidth in dbAllocAG.
Reported-and-tested-by: syzbot+7c808908291a569281a9@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=7c808908291a569281a9
Signed-off-by: Edward Adam Davis <eadavis@qq.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | fs/jfs/jfs_dmap.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c index 9ac1fc2ed05b..0e1019382cf5 100644 --- a/fs/jfs/jfs_dmap.c +++ b/fs/jfs/jfs_dmap.c @@ -204,6 +204,10 @@ int dbMount(struct inode *ipbmap) bmp->db_aglevel = le32_to_cpu(dbmp_le->dn_aglevel); bmp->db_agheight = le32_to_cpu(dbmp_le->dn_agheight); bmp->db_agwidth = le32_to_cpu(dbmp_le->dn_agwidth); + if (!bmp->db_agwidth) { + err = -EINVAL; + goto err_release_metapage; + } bmp->db_agstart = le32_to_cpu(dbmp_le->dn_agstart); bmp->db_agl2size = le32_to_cpu(dbmp_le->dn_agl2size); if (bmp->db_agl2size > L2MAXL2SIZE - L2MAXAG || |