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| author | Jan Kara <jack@suse.cz> | 2014-10-30 10:53:16 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-11-14 08:47:58 -0800 |
| commit | 6ce75ebb5334c12febaf520682926ce34c3cfe2b (patch) | |
| tree | dbbac8662cbdbf67d6cb406e9aec9cbb9749f8c6 /fs/ext4 | |
| parent | 4bf70f9f0280e5f396e4338967982c4325167259 (diff) | |
| download | lwn-6ce75ebb5334c12febaf520682926ce34c3cfe2b.tar.gz lwn-6ce75ebb5334c12febaf520682926ce34c3cfe2b.zip | |
ext4: fix oops when loading block bitmap failed
commit 599a9b77ab289d85c2d5c8607624efbe1f552b0f upstream.
When we fail to load block bitmap in __ext4_new_inode() we will
dereference NULL pointer in ext4_journal_get_write_access(). So check
for error from ext4_read_block_bitmap().
Coverity-id: 989065
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/ext4')
| -rw-r--r-- | fs/ext4/ialloc.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c index 1ecd3a8c2444..4d4718cf25ab 100644 --- a/fs/ext4/ialloc.c +++ b/fs/ext4/ialloc.c @@ -793,6 +793,10 @@ got: struct buffer_head *block_bitmap_bh; block_bitmap_bh = ext4_read_block_bitmap(sb, group); + if (!block_bitmap_bh) { + err = -EIO; + goto out; + } BUFFER_TRACE(block_bitmap_bh, "get block bitmap access"); err = ext4_journal_get_write_access(handle, block_bitmap_bh); if (err) { |