Commit d31a56d2 authored by Committed by Greg Kroah-Hartman
net/nfc: Avoid stalls when nfc_alloc_send_skb() returned NULL.
commit 3bc53be9db21040b5d2de4d455f023c8c494aa68 upstream. syzbot is reporting stalls at nfc_llcp_send_ui_frame() . This is because nfc_llcp_send_ui_frame() is retrying the loop without any delay when nonblocking nfc_alloc_send_skb() returned NULL. Since there is no need to use MSG_DONTWAIT if we retry until sock_alloc_send_pskb() succeeds, let's use blocking call. Also, in case an unexpected error occurred, let's break the loop if blocking nfc_alloc_send_skb() failed.  https://syzkaller.appspot.com/bug?id=4a131cc571c3733e0eff6bc673f4e36ae48f19c6Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Reported-by: syzbot <email@example.com> Signed-off-by: David S. Miller <firstname.lastname@example.org> Signed-off-by: Greg Kroah-Hartman <email@example.com>
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