From a8a1d01018f66c5cc3cb2a4c194e55edcf0e50ec Mon Sep 17 00:00:00 2001 From: Theodore Ts'o Date: Wed, 15 May 2019 00:51:19 -0400 Subject: [PATCH] ext4: fix block validity checks for journal inodes using indirect blocks commit 170417c8c7bb2cbbdd949bf5c443c0c8f24a203b upstream. Commit 345c0dbf3a30 ("ext4: protect journal inode's blocks using block_validity") failed to add an exception for the journal inode in ext4_check_blockref(), which is the function used by ext4_get_branch() for indirect blocks. This caused attempts to read from the ext3-style journals to fail with: [ 848.968550] EXT4-fs error (device sdb7): ext4_get_branch:171: inode #8: block 30343695: comm jbd2/sdb7-8: invalid block Fix this by adding the missing exception check. Fixes: 345c0dbf3a30 ("ext4: protect journal inode's blocks using block_validity") Reported-by: Arthur Marsh Signed-off-by: Theodore Ts'o [bwh: Backported to 3.16: Use EXT4_HAS_COMPAT_FEATURE] Signed-off-by: Ben Hutchings --- fs/ext4/block_validity.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/fs/ext4/block_validity.c b/fs/ext4/block_validity.c index f4f805989beb2..2a7efb6e1986d 100644 --- a/fs/ext4/block_validity.c +++ b/fs/ext4/block_validity.c @@ -277,6 +277,12 @@ int ext4_check_blockref(const char *function, unsigned int line, __le32 *bref = p; unsigned int blk; + if (EXT4_HAS_COMPAT_FEATURE(inode->i_sb, + EXT4_FEATURE_COMPAT_HAS_JOURNAL) && + (inode->i_ino == + le32_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_journal_inum))) + return 0; + while (bref < p+max) { blk = le32_to_cpu(*bref++); if (blk && -- 2.47.2