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ext4: fix oops when loading block bitmap failed 

commit 599a9b77ab 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>
This commit is contained in:
Jan Kara 2014-10-30 10:53:16 -04:00 committed by Greg Kroah-Hartman
parent e2e5d26de9
commit 321c378693
1 changed files with 4 additions and 0 deletions
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4
fs/ext4/ialloc.c
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@ -864,6 +864,10 @@ 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) {