diff options
| author | Andreas Gruenbacher <agruenba@redhat.com> | 2022-12-04 17:00:04 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-02-09 11:26:48 +0100 |
| commit | 46c9088cabd4d0469fdb61ac2a9c5003057fe94d (patch) | |
| tree | 3335c16dcf14a974f11d7867f5fa71090d8927e9 | |
| parent | 8eb2e58a92e08473fb44294c783377c9eba99cd7 (diff) | |
gfs2: Always check inode size of inline inodes
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>
| -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 005e920f5d4a..4bbfb156e6a4 100644 --- a/fs/gfs2/aops.c +++ b/fs/gfs2/aops.c @@ -452,8 +452,6 @@ 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 f785af2aa23c..0ec1eaf33833 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 fcf106aea521..450032b4c886 100644 --- a/fs/gfs2/glops.c +++ b/fs/gfs2/glops.c @@ -450,6 +450,9 @@ 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); |