[PATCH net v2 2/3] net: devmem: return EMSGSIZE on type mismatch
From: Mina Almasry <hidden>
Date: 2026-08-03 17:14:50
Also in:
lkml
Subsystem:
networking [general], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
When a devmem payload mixes with a standard page payload, return
-EMSGSIZE instead of -EFAULT. This enables tcp_sendmsg to seamlessly
fall back to creating a new segment instead of failing the socket send.
Fixes: bd61848900bff ("net: devmem: Implement TX path")
Cc: Pavel Begunkov <asml.silence@gmail.com>
Cc: Stanislav Fomichev <sdf@fomichev.me>
Cc: Bobby Eshleman <redacted>
Signed-off-by: Mina Almasry <redacted>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
---
net/core/datagram.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/net/core/datagram.c b/net/core/datagram.c
index 173b5d97bd409..6f8ffd61bcab4 100644
--- a/net/core/datagram.c
+++ b/net/core/datagram.c@@ -638,7 +638,7 @@ int zerocopy_fill_skb_from_iter(struct sk_buff *skb, int frag = skb_shinfo(skb)->nr_frags; if (!skb_frags_readable(skb)) - return -EFAULT; + return -EMSGSIZE; while (length && iov_iter_count(from)) { struct page *head, *last_head = NULL;
@@ -713,7 +713,7 @@ zerocopy_fill_skb_from_devmem(struct sk_buff *skb, struct iov_iter *from, struct net_iov *niov; if (i && skb_frags_readable(skb)) - return -EFAULT; + return -EMSGSIZE; /* Devmem filling works by taking an IOVEC from the user where the * iov_addrs are interpreted as an offset in bytes into the dma-buf to
--
2.55.0.571.g244d577d93-goog