This is a note to let you know that I've just added the patch titled
ksmbd: fix out of bounds in smb3_decrypt_req()
to the 6.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ksmbd-fix-out-of-bounds-in-smb3_decrypt_req.patch
and it can be found in the queue-6.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 8abf3ab6101960a692629414ef6e700064c7c6d9
Author: Namjae Jeon <linkinjeon@xxxxxxxxxx>
Date: Sat Jul 22 00:09:28 2023 +0900
ksmbd: fix out of bounds in smb3_decrypt_req()
[ 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>
diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c
index 6d0896c76b098..dab4c7d710914 100644
--- a/fs/smb/server/smb2pdu.c
+++ b/fs/smb/server/smb2pdu.c
@@ -8623,7 +8623,8 @@ int smb3_decrypt_req(struct ksmbd_work *work)
struct smb2_transform_hdr *tr_hdr = smb2_get_msg(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;
