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Michal Schmidt 30b7e67e33 i40e: prevent crash on probe if hw registers have invalid values 
commit fc6f716a5069180c40a8c9b63631e97da34f64a3 upstream.

The hardware provides the indexes of the first and the last available
queue and VF. From the indexes, the driver calculates the numbers of
queues and VFs. In theory, a faulty device might say the last index is
smaller than the first index. In that case, the driver's calculation
would underflow, it would attempt to write to non-existent registers
outside of the ioremapped range and crash.

I ran into this not by having a faulty device, but by an operator error.
I accidentally ran a QE test meant for i40e devices on an ice device.
The test used 'echo i40e > /sys/...ice PCI device.../driver_override',
bound the driver to the device and crashed in one of the wr32 calls in
i40e_clear_hw.

Add checks to prevent underflows in the calculations of num_queues and
num_vfs. With this fix, the wrong device probing reports errors and
returns a failure without crashing.

Fixes: 838d41d92a90 ("i40e: clear all queues and interrupts")
Signed-off-by: Michal Schmidt <mschmidt@redhat.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@intel.com> (A Contingent worker at Intel)
Link: https://lore.kernel.org/r/20231011233334.336092-2-jacob.e.keller@intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-11-08 11:26:10 +01:00
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intel i40e: prevent crash on probe if hw registers have invalid values 2024-11-08 11:26:10 +01:00
marvell Backport mac80211 patches from linux-6.1.y 2024-06-15 16:29:20 -03:00
mediatek Backport mac80211 patches from linux-6.1.y 2024-06-15 16:29:20 -03:00
mellanox mlxsw: fix mlxsw_sp2_nve_vxlan_learning_set() return type 2024-11-08 11:25:45 +01:00
micrel Backport mac80211 patches from linux-6.1.y 2024-06-15 16:29:20 -03:00
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