5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Namjae Jeon <linkinjeon@xxxxxxxxxx>
[ Upstream commit dc318846f3dd54574a36ae97fc8d8b75dd7cdb1e ]
smb3_decrypt_req() validate if pdu_length is smaller than
smb2_transform_hdr size.
Reported-by: zdi-disclosures@xxxxxxxxxxxxxx # ZDI-CAN-21589
Signed-off-by: Namjae Jeon <linkinjeon@xxxxxxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
fs/ksmbd/smb2pdu.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index 7983e8c9c89d0..f5506853ac0fa 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -8649,7 +8649,8 @@ int smb3_decrypt_req(struct ksmbd_work *work)
struct smb2_transform_hdr *tr_hdr = (struct smb2_transform_hdr *)buf;
int rc = 0;
- if (buf_data_size < sizeof(struct smb2_hdr)) {
+ if (pdu_length < sizeof(struct smb2_transform_hdr) ||
+ buf_data_size < sizeof(struct smb2_hdr)) {
pr_err("Transform message is too small (%u)\n",
pdu_length);
return -ECONNABORTED;
--
2.40.1
