From: Jan Kara Subject: [PATCH] jbd2: Fix oops in jbd2_journal_init_inode() on corrupted fs Date: Mon, 19 Jan 2009 16:57:55 +0100 Message-ID: <1232380676-12359-1-git-send-email-jack@suse.cz> References: Cc: Andrew Morton , Jan Kara , dmaciejak@fortinet.com To: linux-ext4@vger.kernel.org Return-path: Received: from styx.suse.cz ([82.119.242.94]:40891 "EHLO mail.suse.cz" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751490AbZASP55 (ORCPT ); Mon, 19 Jan 2009 10:57:57 -0500 In-Reply-To: Sender: linux-ext4-owner@vger.kernel.org List-ID: On 32-bit system with CONFIG_LBD getblk can fail because provided block number is too big. Make JBD2 gracefully handle that. Reported by David Maciejak in http://bugzilla.kernel.org/show_bug.cgi?id=12370. Signed-off-by: Jan Kara CC: dmaciejak@fortinet.com --- fs/jbd2/journal.c | 40 +++++++++++++++++++++++++++------------- 1 files changed, 27 insertions(+), 13 deletions(-) diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c index f6bff9d..a263f76 100644 --- a/fs/jbd2/journal.c +++ b/fs/jbd2/journal.c @@ -650,6 +650,8 @@ struct journal_head *jbd2_journal_get_descriptor_buffer(journal_t *journal) return NULL; bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize); + if (!bh) + return NULL; lock_buffer(bh); memset(bh->b_data, 0, journal->j_blocksize); set_buffer_uptodate(bh); @@ -1035,15 +1037,14 @@ journal_t * jbd2_journal_init_dev(struct block_device *bdev, /* journal descriptor can store up to n blocks -bzzz */ journal->j_blocksize = blocksize; + jbd2_stats_proc_init(journal); n = journal->j_blocksize / sizeof(journal_block_tag_t); journal->j_wbufsize = n; journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_KERNEL); if (!journal->j_wbuf) { printk(KERN_ERR "%s: Cant allocate bhs for commit thread\n", __func__); - kfree(journal); - journal = NULL; - goto out; + goto out_err; } journal->j_dev = bdev; journal->j_fs_dev = fs_dev; @@ -1053,14 +1054,22 @@ journal_t * jbd2_journal_init_dev(struct block_device *bdev, p = journal->j_devname; while ((p = strchr(p, '/'))) *p = '!'; - jbd2_stats_proc_init(journal); bh = __getblk(journal->j_dev, start, journal->j_blocksize); - J_ASSERT(bh != NULL); + if (!bh) { + printk(KERN_ERR + "%s: Cannot get buffer for journal superblock\n", + __func__); + goto out_err; + } journal->j_sb_buffer = bh; journal->j_superblock = (journal_superblock_t *)bh->b_data; -out: + return journal; +out_err: + jbd2_stats_proc_exit(journal); + kfree(journal); + return NULL; } /** @@ -1108,9 +1117,7 @@ journal_t * jbd2_journal_init_inode (struct inode *inode) if (!journal->j_wbuf) { printk(KERN_ERR "%s: Cant allocate bhs for commit thread\n", __func__); - jbd2_stats_proc_exit(journal); - kfree(journal); - return NULL; + goto out_err; } err = jbd2_journal_bmap(journal, 0, &blocknr); @@ -1118,17 +1125,24 @@ journal_t * jbd2_journal_init_inode (struct inode *inode) if (err) { printk(KERN_ERR "%s: Cannnot locate journal superblock\n", __func__); - jbd2_stats_proc_exit(journal); - kfree(journal); - return NULL; + goto out_err; } bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize); - J_ASSERT(bh != NULL); + if (!bh) { + printk(KERN_ERR + "%s: Cannot get buffer for journal superblock\n", + __func__); + goto out_err; + } journal->j_sb_buffer = bh; journal->j_superblock = (journal_superblock_t *)bh->b_data; return journal; +out_err: + jbd2_stats_proc_exit(journal); + kfree(journal); + return NULL; } /* -- 1.6.0.2