On Friday 03 August 2012 07:11 PM, Fabio Estevam wrote:
> Commit 30161f6b2e7d1 (Input: gpio_keys - clean up device tree parser)
> introduced the following kernel crash for a dt based kernel:
> ..
> Unable to handle kernel NULL pointer dereference at virtual address 00000004
> pgd = 80004000
> [00000004] *pgd=00000000
> Internal error: Oops: 805 [#1] ARM
> Modules linked in:
> CPU: 0 Not tainted (3.5.0-next-20120802+ #1366)
> PC is at gpio_keys_probe+0x154/0x8c0
> LR is at of_gpiochip_find_and_xlate+0x54/0x70
> pc : [<803ddbac>] lr : [<801ed2f4>] psr: 60000013
> sp : 9f851df8 ip : 00000002 fp : 9f851e5c
> r10: 9f873d00 r9 : 00000001 r8 : 9fa2f900
> r7 : 809c0920 r6 : 9f873d08 r5 : 00000000 r4 : 809c09d4
> r3 : 805af10c r2 : 000000c0 r1 : 9f851db4 r0 : 000000d5
> Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel
> Control: 10c5387d Table: 90004019 DAC: 00000015
> Process swapper (pid: 1, stack limit = 0x9f8502e8)
> Stack: (0x9f851df8 to 0x9f852000)
> ....
>
> The reason for the crash was due to 'button = &pdata->buttons[i++];'
> returning a NULL pointer, and then 'button' was accessed afterwards
> without checking for NULL.
>
> Fix this by correctly assigning 'pdata->buttons' and also add a NULL
> pointer check for 'button' pointer.
>
> Signed-off-by: Fabio Estevam <[email protected]>
> Acked-by: Alexandre Pereira da Silva <[email protected]>
>
Should we cc stable?
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