linux-kernel - [PATCH net v2] bnxt_en: Fix NULL pointer crash in bnxt_ptp

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Message-Id: <20260105-bnxt-v2-1-9ac69edef726@debian.org>
Date: Mon, 05 Jan 2026 04:00:16 -0800
From: Breno Leitao <leitao@...ian.org>
To: Michael Chan <michael.chan@...adcom.com>, 
 Pavan Chebbi <pavan.chebbi@...adcom.com>, 
 Andrew Lunn <andrew+netdev@...n.ch>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Richard Cochran <richardcochran@...il.com>, 
 "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>, 
 Vadim Fedorenko <vadim.fedorenko@...ux.dev>, 
 Vladimir Oltean <vladimir.oltean@....com>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
 kernel-team@...a.com, Breno Leitao <leitao@...ian.org>, 
 stable@...r.kernel.org
Subject: [PATCH net v2] bnxt_en: Fix NULL pointer crash in bnxt_ptp_enable
 during error cleanup

When bnxt_init_one() fails during initialization (e.g.,
bnxt_init_int_mode returns -ENODEV), the error path calls
bnxt_free_hwrm_resources() which destroys the DMA pool and sets
bp->hwrm_dma_pool to NULL. Subsequently, bnxt_ptp_clear() is called,
which invokes ptp_clock_unregister().

Since commit a60fc3294a37 ("ptp: rework ptp_clock_unregister() to
disable events"), ptp_clock_unregister() now calls
ptp_disable_all_events(), which in turn invokes the driver's .enable()
callback (bnxt_ptp_enable()) to disable PTP events before completing the
unregistration.

bnxt_ptp_enable() attempts to send HWRM commands via bnxt_ptp_cfg_pin()
and bnxt_ptp_cfg_event(), both of which call hwrm_req_init(). This
function tries to allocate from bp->hwrm_dma_pool, causing a NULL
pointer dereference:

  bnxt_en 0000:01:00.0 (unnamed net_device) (uninitialized): bnxt_init_int_mode err: ffffffed
  KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
  Call Trace:
   __hwrm_req_init (drivers/net/ethernet/broadcom/bnxt/bnxt_hwrm.c:72)
   bnxt_ptp_enable (drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c:323 drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c:517)
   ptp_disable_all_events (drivers/ptp/ptp_chardev.c:66)
   ptp_clock_unregister (drivers/ptp/ptp_clock.c:518)
   bnxt_ptp_clear (drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c:1134)
   bnxt_init_one (drivers/net/ethernet/broadcom/bnxt/bnxt.c:16889)

Lines are against commit f8f9c1f4d0c7 ("Linux 6.19-rc3")

Fix this by clearing and unregistering ptp (bnxt_ptp_clear()) before
freeing HWRM resources.

Suggested-by: Pavan Chebbi <pavan.chebbi@...adcom.com>
Signed-off-by: Breno Leitao <leitao@...ian.org>
Fixes: a60fc3294a37 ("ptp: rework ptp_clock_unregister() to disable events")
Cc: stable@...r.kernel.org
---
Changes in v2:
- Instead of checking for HWRM resources in bnxt_ptp_enable(), call it
  when HWRM resources are availble (Pavan Chebbi)
- Link to v1: https://patch.msgid.link/20251231-bnxt-v1-1-8f9cde6698b4@debian.org
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index d160e54ac121..5a4af8abf848 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -16891,11 +16891,11 @@ static int bnxt_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)

 init_err_pci_clean:
 	bnxt_hwrm_func_drv_unrgtr(bp);
+	bnxt_ptp_clear(bp);
+	kfree(bp->ptp_cfg);
 	bnxt_free_hwrm_resources(bp);
 	bnxt_hwmon_uninit(bp);
 	bnxt_ethtool_free(bp);
-	bnxt_ptp_clear(bp);
-	kfree(bp->ptp_cfg);
 	bp->ptp_cfg = NULL;
 	kfree(bp->fw_health);
 	bp->fw_health = NULL;

---
base-commit: e146b276a817807b8f4a94b5781bf80c6c00601b
change-id: 20251231-bnxt-c54d317d8bfe

Best regards,
--  
Breno Leitao <leitao@...ian.org>