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Tetsuo Handa 115df2a7c5 net/nfc: Avoid stalls when nfc_alloc_send_skb() returned NULL. 
commit 3bc53be9db upstream.

syzbot is reporting stalls at nfc_llcp_send_ui_frame() [1]. 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.

[1] https://syzkaller.appspot.com/bug?id=4a131cc571c3733e0eff6bc673f4e36ae48f19c6

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Reported-by: syzbot <syzbot+d29d18215e477cfbfbdd@syzkaller.appspotmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-07-22 14:28:49 +02:00
arch x86/paravirt: Make native_save_fl() extern inline 2018-07-22 14:28:42 +02:00
block block: do not use interruptible wait anywhere 2018-07-22 14:28:48 +02:00
certs
crypto crypto: af_alg - Initialize sg_num_bytes in error code path 2018-07-22 14:28:48 +02:00
Documentation kbuild: delete INSTALL_FW_PATH from kbuild documentation 2018-07-17 11:39:30 +02:00
drivers PCI: hv: Disable/enable IRQs rather than BH in hv_compose_msi_msg() 2018-07-22 14:28:48 +02:00
firmware
fs autofs: fix slab out of bounds read in getname_kernel() 2018-07-22 14:28:49 +02:00
include bdi: Fix another oops in wb_workfn() 2018-07-22 14:28:49 +02:00
init
ipc
kernel clocksource: Initialize cs->wd_list 2018-07-22 14:28:48 +02:00
lib lib/vsprintf: Remove atomic-unsafe support for %pCr 2018-07-03 11:24:48 +02:00
mm bdi: Fix another oops in wb_workfn() 2018-07-22 14:28:49 +02:00
net net/nfc: Avoid stalls when nfc_alloc_send_skb() returned NULL. 2018-07-22 14:28:49 +02:00
samples
scripts Kbuild: fix # escaping in .cmd files for future Make 2018-07-11 16:29:21 +02:00
security
sound ALSA: hda - Handle pm failure during hotplug 2018-07-17 11:39:29 +02:00
tools tools build: fix # escaping in .cmd files for future Make 2018-07-17 11:39:30 +02:00
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Makefile Linux 4.14.56 2018-07-17 11:39:34 +02:00
README

README 

Linux kernel
============

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.