In the Linux kernel, the following vulnerability has been resolved: net: sparx5: skip ptp deinit if init was skipped sparx5_ptp_init() ret
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In the Linux kernel, the following vulnerability has been resolved:
net: sparx5: skip ptp deinit if init was skipped
sparx5_ptp_init() returns early on the base lan969x variants
because they do not have the SPX5_FEATURE_PTP flag. It also returns early
when no "ptp" interrupt is described. Unbinding the driver then causes a
NULL pointer dereference when cleaning up uninitialized tx_skbs queues:
1Unable to handle kernel NULL pointer dereference at virtual address 20000000000000008 3Call trace: 4skb_queue_purge_reason+0x68/0x120 (P) 5sparx5_ptp_deinit+0x64/0xc0 6mchp_sparx5_remove+0x38/0x70 7platform_remove+0x20/0x30 8device_remove+0x4c/0x80Before per-port tx_skbs were added, a NULL dereference would have happened
when calling ptp_clock_unregister() on the never-registered PTP clocks.
Fix by returning early in sparx5_ptp_deinit() if PTP is not used.
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