@@ -148,6 +148,7 @@ static Indirect *ext4_get_branch(struct inode *inode, int depth,
struct super_block *sb = inode->i_sb;
Indirect *p = chain;
struct buffer_head *bh;
+ unsigned int key;
int ret = -EIO;
*err = 0;
@@ -156,7 +157,13 @@ static Indirect *ext4_get_branch(struct inode *inode, int depth,
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;
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> --- Hi Ted! Just a note: this patch, as you suggested, is taken from the patch with message-id 20221011155623.14840-1-lhenriques@suse.de . Cheers, -- Luís fs/ext4/indirect.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)