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[net-next,v4,03/27] skbuff: don't mix ubuf_info from different sources

Message ID 8fc991e842a43fef95b09f2d387567d06999c11c.1657194434.git.asml.silence@gmail.com (mailing list archive)
State New
Headers show
Series io_uring zerocopy send | expand

Commit Message

Pavel Begunkov July 7, 2022, 11:49 a.m. UTC 
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>
---
 net/core/skbuff.c | 4 ++++
 1 file changed, 4 insertions(+)
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Patch

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 5b3559cb1d82..09f56bfa2771 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -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
 		 */