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authorChristoph Hellwig <hch@lst.de>2018-06-29 16:37:24 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-06-29 16:51:51 +0300
commite88958e6369aeba48623afa18dd67fdf41c98d75 (patch)
treef66935ea26b2e23e1fcf0c75324e4e78afdc673b /net
parent90368a37fbbe76056db2b703c08903939a2a18dc (diff)
downloadlinux-e88958e6369aeba48623afa18dd67fdf41c98d75.tar.xz
net: handle NULL ->poll gracefully
The big aio poll revert broke various network protocols that don't implement ->poll as a patch in the aio poll serie removed sock_no_poll and made the common code handle this case. Reported-by: syzbot+57727883dbad76db2ef0@syzkaller.appspotmail.com Reported-by: syzbot+cdb0d3176b53d35ad454@syzkaller.appspotmail.com Reported-by: syzbot+2c7e8f74f8b2571c87e8@syzkaller.appspotmail.com Reported-by: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> Fixes: a11e1d432b51 ("Revert changes to convert to ->poll_mask() and aio IOCB_CMD_POLL") Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'net')
-rw-r--r--net/socket.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/socket.c b/net/socket.c
index a564c6ed19d5..85633622c94d 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -1133,6 +1133,8 @@ static __poll_t sock_poll(struct file *file, poll_table *wait)
__poll_t events = poll_requested_events(wait);
sock_poll_busy_loop(sock, events);
+ if (!sock->ops->poll)
+ return 0;
return sock->ops->poll(file, sock, wait) | sock_poll_busy_flag(sock);
}