From 9aa5d32ba269bec0e7eaba2697a986a7b0bc8528 Mon Sep 17 00:00:00 2001 From: Dmitry Monakhov Date: Mon, 13 Oct 2014 03:36:16 -0400 Subject: ext4: Replace open coded mdata csum feature to helper function Besides the fact that this replacement improves code readability it also protects from errors caused direct EXT4_S(sb)->s_es manipulation which may result attempt to use uninitialized csum machinery. #Testcase_BEGIN IMG=/dev/ram0 MNT=/mnt mkfs.ext4 $IMG mount $IMG $MNT #Enable feature directly on disk, on mounted fs tune2fs -O metadata_csum $IMG # Provoke metadata update, likey result in OOPS touch $MNT/test umount $MNT #Testcase_END # Replacement script @@ expression E; @@ - EXT4_HAS_RO_COMPAT_FEATURE(E, EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) + ext4_has_metadata_csum(E) https://bugzilla.kernel.org/show_bug.cgi?id=82201 Signed-off-by: Dmitry Monakhov Signed-off-by: Theodore Ts'o Cc: stable@vger.kernel.org --- fs/ext4/resize.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) (limited to 'fs/ext4/resize.c') diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c index bb0e80f03e2e..d5afb0a0cf25 100644 --- a/fs/ext4/resize.c +++ b/fs/ext4/resize.c @@ -1210,8 +1210,7 @@ static int ext4_set_bitmap_checksums(struct super_block *sb, { struct buffer_head *bh; - if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) + if (!ext4_has_metadata_csum(sb)) return 0; bh = ext4_get_bitmap(sb, group_data->inode_bitmap); -- cgit v1.2.3 From 9378c6768e4fca48971e7b6a9075bc006eda981d Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Thu, 30 Oct 2014 10:52:57 -0400 Subject: ext4: fix overflow when updating superblock backups after resize When there are no meta block groups update_backups() will compute the backup block in 32-bit arithmetics thus possibly overflowing the block number and corrupting the filesystem. OTOH filesystems without meta block groups larger than 16 TB should be rare. Fix the problem by doing the counting in 64-bit arithmetics. Coverity-id: 741252 CC: stable@vger.kernel.org Signed-off-by: Jan Kara Signed-off-by: Theodore Ts'o Reviewed-by: Lukas Czerner --- fs/ext4/resize.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'fs/ext4/resize.c') diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c index f298c60f907d..ca4588388fc3 100644 --- a/fs/ext4/resize.c +++ b/fs/ext4/resize.c @@ -1081,7 +1081,7 @@ static void update_backups(struct super_block *sb, int blk_off, char *data, break; if (meta_bg == 0) - backup_block = group * bpg + blk_off; + backup_block = ((ext4_fsblk_t)group) * bpg + blk_off; else backup_block = (ext4_group_first_block_no(sb, group) + ext4_bg_has_super(sb, group)); -- cgit v1.2.3