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net: unix: allow set_peek_off to fail
unix_dgram_recvmsg() will hold the readlock of the socket until recv is complete. In the same time, we may try to setsockopt(SO_PEEK_OFF) which will hang until unix_dgram_recvmsg() will complete (which can take a while) without allowing us to break out of it, triggering a hung task spew. Instead, allow set_peek_off to fail, this way userspace will not hang. Signed-off-by: Sasha Levin <[email protected]> Acked-by: Pavel Emelyanov <[email protected]> Signed-off-by: David S. Miller <[email protected]>
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