[PATCH V4] ocfs2: pass u64 to ocfs2_truncate_inline maybe overflow

From: Edward Adam Davis
Date: Wed Oct 16 2024 - 07:49:02 EST


Syzbot reported a kernel BUG in ocfs2_truncate_inline.
There are two reasons for this: first, the parameter value passed is greater
than ocfs2_max_inline_data_with_xattr, second, the start and end parameters
of ocfs2_truncate_inline are "unsigned int".

So, we need to add a sanity check for byte_start and byte_len right before
ocfs2_truncate_inline() in ocfs2_remove_inode_range(), if they are greater
than ocfs2_max_inline_data_with_xattr return -EINVAL.

Reported-by: syzbot+81092778aac03460d6b7@xxxxxxxxxxxxxxxxxxxxxxxxx
Closes: https://syzkaller.appspot.com/bug?extid=81092778aac03460d6b7
Signed-off-by: Edward Adam Davis <eadavis@xxxxxx>
---
V1 -> V2: move sanity check to ocfs2_remove_inode_range
V2 -> V3: use ocfs2_max_inline_data_with_xattr return value replace UINT_MAX
V3 -> V4: rename variable, modify return value and comments

fs/ocfs2/file.c | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index ad131a2fc58e..47121ee4b4df 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -1784,6 +1784,14 @@ int ocfs2_remove_inode_range(struct inode *inode,
return 0;

if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
+ int id_count = ocfs2_max_inline_data_with_xattr(inode->i_sb, di);
+
+ if (byte_start > id_count || byte_start + byte_len > id_count) {
+ ret = -EINVAL;
+ mlog_errno(ret);
+ goto out;
+ }
+
ret = ocfs2_truncate_inline(inode, di_bh, byte_start,
byte_start + byte_len, 0);
if (ret) {
--
2.43.0