net/packet: convert po->origdev to an atomic flag

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[ Upstream commit ee5675ecdf ]

syzbot/KCAN reported that po->origdev can be read
while another thread is changing its value.

We can avoid this splat by converting this field
to an actual bit.

Following patches will convert remaining 1bit fields.

Fixes: 80feaacb8a ("[AF_PACKET]: Add option to return orig_dev to userspace.")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Eric Dumazet 2023-03-16 01:10:07 +00:00 • committed by Greg Kroah-Hartman

parent f2d971608a

commit 3eae0f4c31

3 changed files with 26 additions and 8 deletions

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10

net/packet/af_packet.c

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2

net/packet/diag.c

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22

net/packet/internal.h

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