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| author | Haimin Zhang <tcs_kernel@tencent.com> | 2022-03-22 16:59:17 +0300 |
|---|---|---|
| committer | Dave Kleikamp <dave.kleikamp@oracle.com> | 2022-03-22 18:09:19 +0300 |
| commit | a53046291020ec41e09181396c1e829287b48d47 (patch) | |
| tree | 75c5fe996ec52f270cb196cf41c8f6756cf80b3c /fs/jfs | |
| parent | 2cc7cc01c15f57d056318c33705647f87dcd4aab (diff) | |
| download | linux-a53046291020ec41e09181396c1e829287b48d47.tar.xz | |
jfs: prevent NULL deref in diFree
Add validation check for JFS_IP(ipimap)->i_imap to prevent a NULL deref
in diFree since diFree uses it without do any validations.
When function jfs_mount calls diMount to initialize fileset inode
allocation map, it can fail and JFS_IP(ipimap)->i_imap won't be
initialized. Then it calls diFreeSpecial to close fileset inode allocation
map inode and it will flow into jfs_evict_inode. Function jfs_evict_inode
just validates JFS_SBI(inode->i_sb)->ipimap, then calls diFree. diFree use
JFS_IP(ipimap)->i_imap directly, then it will cause a NULL deref.
Reported-by: TCS Robot <tcs_robot@tencent.com>
Signed-off-by: Haimin Zhang <tcs_kernel@tencent.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Diffstat (limited to 'fs/jfs')
| -rw-r--r-- | fs/jfs/inode.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/jfs/inode.c b/fs/jfs/inode.c index 57ab424c05ff..072821b50ab9 100644 --- a/fs/jfs/inode.c +++ b/fs/jfs/inode.c @@ -146,12 +146,13 @@ void jfs_evict_inode(struct inode *inode) dquot_initialize(inode); if (JFS_IP(inode)->fileset == FILESYSTEM_I) { + struct inode *ipimap = JFS_SBI(inode->i_sb)->ipimap; truncate_inode_pages_final(&inode->i_data); if (test_cflag(COMMIT_Freewmap, inode)) jfs_free_zero_link(inode); - if (JFS_SBI(inode->i_sb)->ipimap) + if (ipimap && JFS_IP(ipimap)->i_imap) diFree(inode); /* |