bnxt_en: Fix NULL pointer dereference in reopen failure path
authorSankar Patchineelam <sankar.patchineelam@broadcom.com>
Tue, 28 Mar 2017 23:47:29 +0000 (19:47 -0400)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Mon, 25 Dec 2017 13:22:13 +0000 (14:22 +0100)
commit0ec5f7a3c9b6968c8041b8d3db8797d4e076d72a
treedbe570879bc3b3a42f23f9c20d9cefb7b77439fa
parent7432a60515da37ee9a510c26502e18994c65b6f1
bnxt_en: Fix NULL pointer dereference in reopen failure path

[ Upstream commit 2247925f0942dc4e7c09b1cde45ca18461d94c5f ]

Net device reset can fail when the h/w or f/w is in a bad state.
Subsequent netdevice open fails in bnxt_hwrm_stat_ctx_alloc().
The cleanup invokes bnxt_hwrm_resource_free() which inturn
calls bnxt_disable_int().  In this routine, the code segment

if (ring->fw_ring_id != INVALID_HW_RING_ID)
   BNXT_CP_DB(cpr->cp_doorbell, cpr->cp_raw_cons);

results in NULL pointer dereference as cpr->cp_doorbell is not yet
initialized, and fw_ring_id is zero.

The fix is to initialize cpr fw_ring_id to INVALID_HW_RING_ID before
bnxt_init_chip() is invoked.

Signed-off-by: Sankar Patchineelam <sankar.patchineelam@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/net/ethernet/broadcom/bnxt/bnxt.c