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| author | Hoi Pok Wu <wuhoipok@gmail.com> | 2022-10-25 23:20:45 +0800 |
|---|---|---|
| committer | Dave Kleikamp <dave.kleikamp@oracle.com> | 2022-10-27 17:34:21 -0500 |
| commit | 25e70c6162f207828dd405b432d8f2a98dbf7082 (patch) | |
| tree | 2e8dea56c41ce8c654eabf1ee5f6bbe99af0c228 | |
| parent | ebe060369f8d6e4588b115f252bebf5ba4d64350 (diff) | |
| download | linux-25e70c6162f207828dd405b432d8f2a98dbf7082.tar.bz2 | |
fs: jfs: fix shift-out-of-bounds in dbDiscardAG
This should be applied to most URSAN bugs found recently by syzbot,
by guarding the dbMount. As syzbot feeding rubbish into the bmap
descriptor.
Signed-off-by: Hoi Pok Wu <wuhoipok@gmail.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
| -rw-r--r-- | fs/jfs/jfs_dmap.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c index e1cbfbb60303..765838578a72 100644 --- a/fs/jfs/jfs_dmap.c +++ b/fs/jfs/jfs_dmap.c @@ -198,6 +198,11 @@ int dbMount(struct inode *ipbmap) goto err_release_metapage; } + if (((bmp->db_mapsize - 1) >> bmp->db_agl2size) > MAXAG) { + err = -EINVAL; + goto err_release_metapage; + } + for (i = 0; i < MAXAG; i++) bmp->db_agfree[i] = le64_to_cpu(dbmp_le->dn_agfree[i]); bmp->db_agsize = le64_to_cpu(dbmp_le->dn_agsize); |