diff options
author | Vasily Averin <vvs@virtuozzo.com> | 2018-11-09 11:34:40 -0500 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-11-21 09:22:07 +0100 |
commit | dd6d368f6f18bf30dad1bebba52ed097fb295bed (patch) | |
tree | 3be9d02f9ca9316f3a029ab1b86b471f7b0516a2 /fs | |
parent | c802502a2e808b8eac4fc155109572427d27b803 (diff) |
ext4: missing !bh check in ext4_xattr_inode_write()
commit eb6984fa4ce2837dcb1f66720a600f31b0bb3739 upstream.
According to Ted Ts'o ext4_getblk() called in ext4_xattr_inode_write()
should not return bh = NULL
The only time that bh could be NULL, then, would be in the case of
something really going wrong; a programming error elsewhere (perhaps a
wild pointer dereference) or I/O error causing on-disk file system
corruption (although that would be highly unlikely given that we had
*just* allocated the blocks and so the metadata blocks in question
probably would still be in the cache).
Fixes: e50e5129f384 ("ext4: xattr-in-inode support")
Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org # 4.13
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/ext4/xattr.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c index f36fc5d5b257..302725176571 100644 --- a/fs/ext4/xattr.c +++ b/fs/ext4/xattr.c @@ -1388,6 +1388,12 @@ retry: bh = ext4_getblk(handle, ea_inode, block, 0); if (IS_ERR(bh)) return PTR_ERR(bh); + if (!bh) { + WARN_ON_ONCE(1); + EXT4_ERROR_INODE(ea_inode, + "ext4_getblk() return bh = NULL"); + return -EFSCORRUPTED; + } ret = ext4_journal_get_write_access(handle, bh); if (ret) goto out; |