From: Andreas Gruenbacher agruenba@redhat.com
commit 70376c7ff31221f1d21db5611d8209e677781d3a upstream.
Check if the inode size of stuffed (inline) inodes is within the allowed range when reading inodes from disk (gfs2_dinode_in()). This prevents us from on-disk corruption.
The two checks in stuffed_readpage() and gfs2_unstuffer_page() that just truncate inline data to the maximum allowed size don't actually make sense, and they can be removed now as well.
Reported-by: syzbot+7bb81dfa9cda07d9cd9d@syzkaller.appspotmail.com Signed-off-by: Andreas Gruenbacher agruenba@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/gfs2/aops.c | 2 -- fs/gfs2/bmap.c | 3 --- fs/gfs2/glops.c | 3 +++ 3 files changed, 3 insertions(+), 5 deletions(-)
--- a/fs/gfs2/aops.c +++ b/fs/gfs2/aops.c @@ -427,8 +427,6 @@ static int stuffed_readpage(struct gfs2_ return error;
kaddr = kmap_atomic(page); - if (dsize > gfs2_max_stuffed_size(ip)) - dsize = gfs2_max_stuffed_size(ip); memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize); memset(kaddr + dsize, 0, PAGE_SIZE - dsize); kunmap_atomic(kaddr); --- a/fs/gfs2/bmap.c +++ b/fs/gfs2/bmap.c @@ -61,9 +61,6 @@ static int gfs2_unstuffer_page(struct gf void *kaddr = kmap(page); u64 dsize = i_size_read(inode);
- if (dsize > gfs2_max_stuffed_size(ip)) - dsize = gfs2_max_stuffed_size(ip); - memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize); memset(kaddr + dsize, 0, PAGE_SIZE - dsize); kunmap(page); --- a/fs/gfs2/glops.c +++ b/fs/gfs2/glops.c @@ -449,6 +449,9 @@ static int gfs2_dinode_in(struct gfs2_in ip->i_depth = (u8)depth; ip->i_entries = be32_to_cpu(str->di_entries);
+ if (gfs2_is_stuffed(ip) && inode->i_size > gfs2_max_stuffed_size(ip)) + goto corrupt; + if (S_ISREG(inode->i_mode)) gfs2_set_aops(inode);