John Ogness e85a5151e5 af_packet: TPACKET_V3: fix fill status rwlock imbalance ...

[ Upstream commit 88fd1cb80d ]

After @blk_fill_in_prog_lock is acquired there is an early out vnet
situation that can occur. In that case, the rwlock needs to be
released.

Also, since @blk_fill_in_prog_lock is only acquired when @tp_version
is exactly TPACKET_V3, only release it on that exact condition as
well.

And finally, add sparse annotation so that it is clearer that
prb_fill_curr_block() and prb_clear_blk_fill_status() are acquiring
and releasing @blk_fill_in_prog_lock, respectively. sparse is still
unable to understand the balance, but the warnings are now on a
higher level that make more sense.

Fixes: 632ca50f2c ("af_packet: TPACKET_V3: replace busy-wait loop")
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2020-08-19 08:26:58 +02:00

..

af_packet.c

af_packet: TPACKET_V3: fix fill status rwlock imbalance

2020-08-19 08:26:58 +02:00

diag.c

treewide: Add SPDX license identifier for more missed files

2019-05-21 10:50:45 +02:00

internal.h

net/packet: tpacket_rcv: avoid a producer race condition

2020-03-15 00:25:25 -07:00

Kconfig

treewide: replace '---help---' in Kconfig files with 'help'

2020-06-14 01:57:21 +09:00

Makefile

treewide: Add SPDX license identifier - Makefile/Kconfig

2019-05-21 10:50:46 +02:00