In commit 42bf50a1795a ("can: isotp: support MSG_TRUNC flag when reading
from socket") a new check for recvmsg flags has been introduced that
only checked for the flags that are handled in isotp_recvmsg() itself.
This accidentally removed the MSG_PEEK feature flag which is processed
later in the call chain in __skb_try_recv_from_queue().
Add MSG_PEEK to the set of valid flags to restore the feature.
Fixes: 42bf50a1795a ("can: isotp: support MSG_TRUNC flag when reading from socket")
Link: https://github.com/linux-can/can-utils/issues/347#issuecomment-1079554254
From: Derek Will <derekrobertwill@xxxxxxxxx>
Tested-by: Derek Will <derekrobertwill@xxxxxxxxx>
Signed-off-by: Oliver Hartkopp <socketcan@xxxxxxxxxxxx>
---
net/can/isotp.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/can/isotp.c b/net/can/isotp.c
index f6f8ba1f816d..bafb0fb5f0e0 100644
--- a/net/can/isotp.c
+++ b/net/can/isotp.c
@@ -1048,11 +1048,11 @@ static int isotp_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
struct sk_buff *skb;
struct isotp_sock *so = isotp_sk(sk);
int noblock = flags & MSG_DONTWAIT;
int ret = 0;
- if (flags & ~(MSG_DONTWAIT | MSG_TRUNC))
+ if (flags & ~(MSG_DONTWAIT | MSG_TRUNC | MSG_PEEK))
return -EINVAL;
if (!so->bound)
return -EADDRNOTAVAIL;
--
2.30.2
