diff options
| author | Edward Adam Davis <eadavis@qq.com> | 2025-02-20 14:24:19 +0300 |
|---|---|---|
| committer | Dave Kleikamp <dave.kleikamp@oracle.com> | 2025-02-20 19:19:46 +0300 |
| commit | ddf2846f22e8575d6b4b6a66f2100f168b8cd73d (patch) | |
| tree | 0ee36b0b9c857977dc679bc7eb027380dfb7874e | |
| parent | b61e69bb1c049cf507e3c654fa3dc1568231bd07 (diff) | |
| download | linux-ddf2846f22e8575d6b4b6a66f2100f168b8cd73d.tar.xz | |
jfs: add sanity check for agwidth in dbMount
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>
| -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 || |