tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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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>

authored by

Christoph Hellwig and committed by
Linus Torvalds e88958e6 90368a37

+2
+2
net/socket.c
··· 1133 1133 __poll_t events = poll_requested_events(wait); 1134 1134 1135 1135 sock_poll_busy_loop(sock, events); 1136 + if (!sock->ops->poll) 1137 + return 0; 1136 1138 return sock->ops->poll(file, sock, wait) | sock_poll_busy_flag(sock); 1137 1139 } 1138 1140