From: Jan Kara <jack@suse.cz>
To: Ted Tso <tytso@mit.edu>
Cc: linux-ext4@vger.kernel.org, Jan Kara <jack@suse.cz>
Subject: [PATCH] ext4: Fix oops when loading block bitmap failed
Date: Thu, 23 Oct 2014 15:05:27 +0200 [thread overview]
Message-ID: <1414069527-29803-1-git-send-email-jack@suse.cz> (raw)
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>
---
fs/ext4/ialloc.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 8012a5daf401..ac644c31ca67 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -887,6 +887,10 @@ 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) {
--
1.8.1.4
next reply other threads:[~2014-10-23 13:05 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-23 13:05 Jan Kara [this message]
2014-10-29 0:33 ` [PATCH] ext4: Fix oops when loading block bitmap failed Theodore Ts'o
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