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linux/drivers/net/ethernet/qualcomm/rmnet
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Subash Abhinov Kasiviswanathan fc70f5bf5e net: qualcomm: rmnet: Fix incorrect receive packet handling during cleanup 
During rmnet unregistration, the real device rx_handler is first cleared
followed by the removal of rx_handler_data after the rcu synchronization.

Any packets in the receive path may observe that the rx_handler is NULL.
However, there is no check when dereferencing this value to use the
rmnet_port information.

This fixes following splat by adding the NULL check.

Unable to handle kernel NULL pointer dereference at virtual
address 000000000000000d
pc : rmnet_rx_handler+0x124/0x284
lr : rmnet_rx_handler+0x124/0x284
 rmnet_rx_handler+0x124/0x284
 __netif_receive_skb_core+0x758/0xd74
 __netif_receive_skb+0x50/0x17c
 process_backlog+0x15c/0x1b8
 napi_poll+0x88/0x284
 net_rx_action+0xbc/0x23c
 __do_softirq+0x20c/0x48c

Fixes: ceed73a2cf ("drivers: net: ethernet: qualcomm: rmnet: Initial implementation")
Signed-off-by: Sean Tranchetti <stranche@codeaurora.org>
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>
Link: https://lore.kernel.org/r/1605298325-3705-1-git-send-email-subashab@codeaurora.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-11-16 16:34:49 -08:00
..
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
rmnet_config.c net: rmnet: do not allow to add multiple bridge interfaces 2020-07-04 18:04:55 -07:00
rmnet_config.h net: rmnet: fix bridge mode bugs 2020-02-27 11:45:07 -08:00
rmnet_handlers.c net: qualcomm: rmnet: Fix incorrect receive packet handling during cleanup 2020-11-16 16:34:49 -08:00
rmnet_handlers.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 284 2019-06-05 17:36:37 +02:00
rmnet_map.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-06-17 20:20:36 -07:00
rmnet_map_command.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 284 2019-06-05 17:36:37 +02:00
rmnet_map_data.c net: qualcomm: rmnet: Fix incorrect UL checksum offload logic 2019-07-26 14:20:06 -07:00
rmnet_private.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 284 2019-06-05 17:36:37 +02:00
rmnet_vnd.c net: rmnet: set NETIF_F_LLTX flag 2020-03-08 21:36:37 -07:00
rmnet_vnd.h net: rmnet: print error message when command fails 2020-03-05 11:47:10 -08:00