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can: j1939: fix Use-after-Free, hold skb ref while in use
commit 2030043 upstream. This patch fixes a Use-after-Free found by the syzbot. The problem is that a skb is taken from the per-session skb queue, without incrementing the ref count. This leads to a Use-after-Free if the skb is taken concurrently from the session queue due to a CTS. Fixes: 9d71dd0 ("can: add support of SAE J1939 protocol") Link: https://lore.kernel.org/r/20210521115720.7533-1-o.rempel@pengutronix.de Cc: Hillf Danton <hdanton@sina.com> Cc: linux-stable <stable@vger.kernel.org> Reported-by: syzbot+220c1a29987a9a490903@syzkaller.appspotmail.com Reported-by: syzbot+45199c1b73b4013525cf@syzkaller.appspotmail.com Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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