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skbuff: don't mix ubuf_info from different sources

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We should not append MSG_ZEROCOPY requests to skbuff with non
MSG_ZEROCOPY ubuf_info, they might be not compatible.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Pavel Begunkov
2022-07-12 21:52:27 +01:00
committed by Jakub Kicinski
parent 773ba4fe91
commit 1b4b2b09d4
1 changed files with 4 additions and 0 deletions
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4
net/core/skbuff.c
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@@ -1212,6 +1212,10 @@ struct ubuf_info *msg_zerocopy_realloc(struct sock *sk, size_t size,
const u32 byte_limit = 1 << 19; /* limit to a few TSO */
u32 bytelen, next;
/* there might be non MSG_ZEROCOPY users */
if (uarg->callback != msg_zerocopy_callback)
return NULL;
/* realloc only when socket is locked (TCP, UDP cork),
* so uarg->len and sk_zckey access is serialized
*/