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net: devmem: prevent net-iov / page mixing

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We should either have net_iov or page backed frags in a single skb,
otherwise it blows up down the stack. Don't allow mixing in
zerocopy_fill_skb_from_devmem().

Fixes: bd61848900 ("net: devmem: Implement TX path")
Cc: stable@vger.kernel.org
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Reviewed-by: Mina Almasry <almasrymina@google.com>
Reviewed-by: Bobby Eshleman <bobbyeshleman@meta.com>
Link: https://patch.msgid.link/e3199788c4732545627a4721097ebb71ad737bab.1785150502.git.asml.silence@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Pavel Begunkov
2026-07-30 16:27:03 -07:00
committed by Jakub Kicinski
parent 683c6ba6e5
commit 53a43508ee
1 changed files with 3 additions and 0 deletions
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net/core/datagram.c
+3
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@@ -712,6 +712,9 @@ zerocopy_fill_skb_from_devmem(struct sk_buff *skb, struct iov_iter *from,
size_t virt_addr, size, off;
struct net_iov *niov;
if (i && skb_frags_readable(skb))
return -EFAULT;
/* 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
* send from. We do not support other iter types.