diff options
| author | Andreas Gruenbacher <agruenba@redhat.com> | 2022-12-04 17:00:04 +0100 |
|---|---|---|
| committer | Andreas Gruenbacher <agruenba@redhat.com> | 2022-12-06 16:06:31 +0100 |
| commit | 70376c7ff31221f1d21db5611d8209e677781d3a (patch) | |
| tree | 9b16f2b8d350a4366aacb8418c5e46d597aeb4cc /fs/gfs2 | |
| parent | 7db354444ad8429e660b0f8145d425285d4f90ff (diff) | |
| download | linux-70376c7ff31221f1d21db5611d8209e677781d3a.tar.bz2 | |
gfs2: Always check inode size of inline inodes
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>
Diffstat (limited to 'fs/gfs2')
| -rw-r--r-- | fs/gfs2/aops.c | 2 | ||||
| -rw-r--r-- | fs/gfs2/bmap.c | 3 | ||||
| -rw-r--r-- | fs/gfs2/glops.c | 3 |
3 files changed, 3 insertions, 5 deletions
diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c index 05bee80ac7de..e782b4f1d104 100644 --- a/fs/gfs2/aops.c +++ b/fs/gfs2/aops.c @@ -427,8 +427,6 @@ static int stuffed_readpage(struct gfs2_inode *ip, struct page *page) 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); diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c index 3bdb2c668a71..e7537fd305dd 100644 --- a/fs/gfs2/bmap.c +++ b/fs/gfs2/bmap.c @@ -61,9 +61,6 @@ static int gfs2_unstuffer_page(struct gfs2_inode *ip, struct buffer_head *dibh, 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); diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c index af69a1bacd55..d78b61ecc1cd 100644 --- a/fs/gfs2/glops.c +++ b/fs/gfs2/glops.c @@ -449,6 +449,9 @@ static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf) 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); |