[PATCH v2 4.19/5.4/5.10 1/1] gfs2: Always check inode size of inline inodes

[Fedor Pchelkin]

From: Andreas Gruenbacher <agruenba@xxxxxxxxxx>

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@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Andreas Gruenbacher <agruenba@xxxxxxxxxx>
[pchelkin@xxxxxxxxx: adjust the inode variable inside gfs2_dinode_in with
the format used before upstream commit 7db354444ad8 ("gfs2: Cosmetic
gfs2_dinode_{in,out} cleanup")]
Signed-off-by: Fedor Pchelkin <pchelkin@xxxxxxxxx>
---
v2: add missed From: tag

 fs/gfs2/aops.c  | 2 --
 fs/gfs2/bmap.c  | 3 ---
 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 530659554870..a0430da033b3 100644
--- a/fs/gfs2/aops.c
+++ b/fs/gfs2/aops.c
@@ -451,8 +451,6 @@ 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 b4fde3a8eeb4..eaee95d2ad14 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -69,9 +69,6 @@ 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 bf539eab92c6..db28c240dae3 100644
--- a/fs/gfs2/glops.c
+++ b/fs/gfs2/glops.c
@@ -454,6 +454,9 @@ 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) && ip->i_inode.i_size > gfs2_max_stuffed_size(ip))
+		goto corrupt;
+
 	if (S_ISREG(ip->i_inode.i_mode))
 		gfs2_set_aops(&ip->i_inode);
 
-- 
2.34.1