forked from Minki/linux
d66e0452bf
if device has available_scan_masks set and the buffer is enabled without any scan_elements enabled, in a NULL pointer is dereferenced in iio_compute_scan_bytes() [ 18.993713] Unable to handle kernel NULL pointer dereference at virtual address 00000000 [ 19.002593] pgd = debd4000 [ 19.005432] [00000000] *pgd=9ebc0831, *pte=00000000, *ppte=00000000 [ 19.012329] Internal error: Oops: 17 [#1] PREEMPT ARM [ 19.017639] Modules linked in: [ 19.020843] CPU: 0 Not tainted (3.9.11-00036-g75c888a-dirty #207) [ 19.027587] PC is at _find_first_bit_le+0xc/0x2c [ 19.032440] LR is at iio_compute_scan_bytes+0x2c/0xf4 [ 19.037719] pc : [<c021dc60>] lr : [<c03198d0>] psr: 200d0013 [ 19.037719] sp : debd9ed0 ip : 00000000 fp : 000802bc [ 19.049713] r10: 00000000 r9 : 00000000 r8 : deb67250 [ 19.055206] r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : deb67000 [ 19.062011] r3 : de96ec00 r2 : 00000000 r1 : 00000004 r0 : 00000000 [ 19.068847] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user [ 19.076324] Control: 10c5387d Table: 9ebd4019 DAC: 00000015 problem is the rollback code in iio_update_buffers(), old_mask may be NULL (e.g. on first call) I'm not too confident about the fix; works for me... Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net> Reviewed-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org> |
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| .. | ||
| accel | ||
| adc | ||
| amplifiers | ||
| common | ||
| dac | ||
| frequency | ||
| gyro | ||
| imu | ||
| light | ||
| magnetometer | ||
| pressure | ||
| temperature | ||
| trigger | ||
| buffer_cb.c | ||
| iio_core_trigger.h | ||
| iio_core.h | ||
| industrialio-buffer.c | ||
| industrialio-core.c | ||
| industrialio-event.c | ||
| industrialio-trigger.c | ||
| industrialio-triggered-buffer.c | ||
| inkern.c | ||
| Kconfig | ||
| kfifo_buf.c | ||
| Makefile | ||