[PATCH 5.15.y] ksmbd: transport_ipc: validate payload size before reading handle

[Sasha Levin <sashal@kernel.org>]

From: Qianchang Zhao <pioooooooooip@gmail.com>

[ Upstream commit 6f40e50ceb99fc8ef37e5c56e2ec1d162733fef0 ]

handle_response() dereferences the payload as a 4-byte handle without
verifying that the declared payload size is at least 4 bytes. A malformed
or truncated message from ksmbd.mountd can lead to a 4-byte read past the
declared payload size. Validate the size before dereferencing.

This is a minimal fix to guard the initial handle read.

Fixes: 0626e6641f6b ("cifsd: add server handler for central processing and tranport layers")
Cc: stable@vger.kernel.org
Reported-by: Qianchang Zhao <pioooooooooip@gmail.com>
Signed-off-by: Qianchang Zhao <pioooooooooip@gmail.com>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
[ applied patch to fs/ksmbd/transport_ipc.c instead of fs/smb/server/transport_ipc.c ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/ksmbd/transport_ipc.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/fs/ksmbd/transport_ipc.c b/fs/ksmbd/transport_ipc.c
index 7e6003c6cd9bf..1d57426e9e022 100644
--- a/fs/ksmbd/transport_ipc.c
+++ b/fs/ksmbd/transport_ipc.c
@@ -248,10 +248,16 @@ static void ipc_msg_handle_free(int handle)
 
 static int handle_response(int type, void *payload, size_t sz)
 {
-	unsigned int handle = *(unsigned int *)payload;
+	unsigned int handle;
 	struct ipc_msg_table_entry *entry;
 	int ret = 0;
 
+	/* Prevent 4-byte read beyond declared payload size */
+	if (sz < sizeof(unsigned int))
+		return -EINVAL;
+
+	handle = *(unsigned int *)payload;
+
 	ipc_update_last_active();
 	down_read(&ipc_msg_table_lock);
 	hash_for_each_possible(ipc_msg_table, entry, ipc_table_hlist, handle) {
-- 
2.51.0