From: Luís Henriques lhenriques@suse.de
commit 26d75a16af285a70863ba6a81f85d81e7e65da50 upstream.
If a block is out of range in ext4_get_branch(), -ENOMEM will be returned to user-space. Obviously, this error code isn't really useful. This patch fixes it by making sure the right error code (-EFSCORRUPTED) is propagated to user-space. EUCLEAN is more informative than ENOMEM.
Signed-off-by: Luís Henriques lhenriques@suse.de Link: https://lore.kernel.org/r/20221109181445.17843-1-lhenriques@suse.de Signed-off-by: Theodore Ts'o tytso@mit.edu Cc: stable@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/ext4/indirect.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
--- a/fs/ext4/indirect.c +++ b/fs/ext4/indirect.c @@ -147,6 +147,7 @@ static Indirect *ext4_get_branch(struct struct super_block *sb = inode->i_sb; Indirect *p = chain; struct buffer_head *bh; + unsigned int key; int ret = -EIO;
*err = 0; @@ -155,7 +156,13 @@ static Indirect *ext4_get_branch(struct if (!p->key) goto no_block; while (--depth) { - bh = sb_getblk(sb, le32_to_cpu(p->key)); + key = le32_to_cpu(p->key); + if (key > ext4_blocks_count(EXT4_SB(sb)->s_es)) { + /* the block was out of range */ + ret = -EFSCORRUPTED; + goto failure; + } + bh = sb_getblk(sb, key); if (unlikely(!bh)) { ret = -ENOMEM; goto failure;