From: Kemeng Shi shikemeng@huaweicloud.com
commit 11b6890be0084ad4df0e06d89a9fdcc948472c65 upstream.
ext4_free_blocks will retrieve block from bh if block parameter is zero. Retrieve block before ext4_free_blocks_simple to avoid potentially passing wrong block to ext4_free_blocks_simple.
Signed-off-by: Kemeng Shi shikemeng@huaweicloud.com Cc: stable@kernel.org Reviewed-by: Ojaswin Mujoo ojaswin@linux.ibm.com Link: https://lore.kernel.org/r/20230603150327.3596033-9-shikemeng@huaweicloud.com Signed-off-by: Theodore Ts'o tytso@mit.edu Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/ext4/mballoc.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-)
--- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -6171,12 +6171,6 @@ void ext4_free_blocks(handle_t *handle,
sbi = EXT4_SB(sb);
- if (sbi->s_mount_state & EXT4_FC_REPLAY) { - ext4_free_blocks_simple(inode, block, count); - return; - } - - might_sleep(); if (bh) { if (block) BUG_ON(block != bh->b_blocknr); @@ -6184,6 +6178,13 @@ void ext4_free_blocks(handle_t *handle, block = bh->b_blocknr; }
+ if (sbi->s_mount_state & EXT4_FC_REPLAY) { + ext4_free_blocks_simple(inode, block, count); + return; + } + + might_sleep(); + if (!(flags & EXT4_FREE_BLOCKS_VALIDATED) && !ext4_inode_block_valid(inode, block, count)) { ext4_error(sb, "Freeing blocks not in datazone - "