sendpage was not designed for processing of the Slab pages,
in some situations it can trigger BUG_ON on receiving side.
Signed-off-by: Vasily Averin <v...@virtuozzo.com>
---
net/ipv4/tcp.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index ad07dd71063d..dbb08140cdc9 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -943,6 +943,10 @@ ssize_t do_tcp_sendpages(struct sock *sk, struct page
*page, int offset,
ssize_t copied;
long timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
+ if (IS_ENABLED(CONFIG_DEBUG_VM) &&
+ WARN_ONCE(PageSlab(page), "page must not be a Slab one"))
+ return -EINVAL;
+
/* Wait for a connection to finish. One exception is TCP Fast Open
* (passive side) where data is allowed to be sent before a connection
* is fully established.
--
2.17.1
