From: Vasundhara Volam Date: Sun, 6 Sep 2020 02:55:37 +0000 (-0400) Subject: bnxt_en: Fix NULL ptr dereference crash in bnxt_fw_reset_task() X-Git-Tag: v5.8.12~52 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=0d7002517f9bb2de70ab42787413bd2767862692;p=thirdparty%2Fkernel%2Fstable.git bnxt_en: Fix NULL ptr dereference crash in bnxt_fw_reset_task() [ Upstream commit b16939b59cc00231a75d224fd058d22c9d064976 ] bnxt_fw_reset_task() which runs from a workqueue can race with bnxt_remove_one(). For example, if firmware reset and VF FLR are happening at about the same time. bnxt_remove_one() already cancels the workqueue and waits for it to finish, but we need to do this earlier before the devlink reporters are destroyed. This will guarantee that the devlink reporters will always be valid when bnxt_fw_reset_task() is still running. Fixes: b148bb238c02 ("bnxt_en: Fix possible crash in bnxt_fw_reset_task().") Reviewed-by: Edwin Peer Signed-off-by: Vasundhara Volam Signed-off-by: Michael Chan Signed-off-by: Jakub Kicinski Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c index 58f8f05d4a662..3612039e74396 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c @@ -11498,6 +11498,10 @@ static void bnxt_remove_one(struct pci_dev *pdev) if (BNXT_PF(bp)) bnxt_sriov_disable(bp); + clear_bit(BNXT_STATE_IN_FW_RESET, &bp->state); + bnxt_cancel_sp_work(bp); + bp->sp_event = 0; + bnxt_dl_fw_reporters_destroy(bp, true); if (BNXT_PF(bp)) devlink_port_type_clear(&bp->dl_port); @@ -11505,9 +11509,6 @@ static void bnxt_remove_one(struct pci_dev *pdev) unregister_netdev(dev); bnxt_dl_unregister(bp); bnxt_shutdown_tc(bp); - clear_bit(BNXT_STATE_IN_FW_RESET, &bp->state); - bnxt_cancel_sp_work(bp); - bp->sp_event = 0; bnxt_clear_int_mode(bp); bnxt_hwrm_func_drv_unrgtr(bp);