From: Pavel Begunkov asml.silence@gmail.com
[ Upstream commit 1b4b2b09d4fb451029b112f17d34792e0277aeb2 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- net/core/skbuff.c | 4 ++++ 1 file changed, 4 insertions(+)
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 */