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linux/drivers/hwtracing/intel_th
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Alexander Shishkin e78e1fdb28 intel_th: Fix a NULL dereference when hub driver is not loaded 
Connecting master to an output port when GTH driver module is not loaded
triggers a NULL dereference:

> RIP: 0010:intel_th_set_output+0x35/0x70 [intel_th]
> Call Trace:
>  ? sth_stm_link+0x12/0x20 [intel_th_sth]
>  stm_source_link_store+0x164/0x270 [stm_core]
>  dev_attr_store+0x17/0x30
>  sysfs_kf_write+0x3e/0x50
>  kernfs_fop_write+0xda/0x1b0
>  __vfs_write+0x1b/0x40
>  vfs_write+0xb9/0x1a0
>  ksys_write+0x67/0xe0
>  __x64_sys_write+0x1a/0x20
>  do_syscall_64+0x57/0x1d0
>  entry_SYSCALL_64_after_hwframe+0x44/0xa9

Make sure the module in question is loaded and return an error if not.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Fixes: 39f4034693 ("intel_th: Add driver infrastructure for Intel(R) Trace Hub devices")
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reported-by: Ammy Yi <ammy.yi@intel.com>
Tested-by: Ammy Yi <ammy.yi@intel.com>
Cc: stable@vger.kernel.org # v4.4
Link: https://lore.kernel.org/r/20200706161339.55468-5-alexander.shishkin@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-07-10 15:12:48 +02:00
..
acpi.c intel_th: Communicate IRQ via resource 2019-05-03 18:14:29 +02:00
core.c intel_th: Fix a NULL dereference when hub driver is not loaded 2020-07-10 15:12:48 +02:00
debug.c intel_th: Add SPDX GPL-2.0 header to replace GPLv2 boilerplate 2018-03-28 18:47:19 +03:00
debug.h intel_th: Add SPDX GPL-2.0 header to replace GPLv2 boilerplate 2018-03-28 18:47:19 +03:00
gth.c intel_th: gth: Fix the window switching sequence 2019-11-04 15:01:22 +01:00
gth.h intel_th: Add switch triggering support 2019-05-03 18:16:21 +02:00
intel_th.h intel_th: Disallow multi mode on devices where it's broken 2020-03-18 11:28:22 +01:00
Kconfig treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
Makefile intel_th: msu-sink: An example msu buffer "sink" 2019-07-25 13:03:18 +02:00
msu-sink.c intel_th: msu-sink: An example msu buffer "sink" 2019-07-25 13:03:18 +02:00
msu.c intel_th: msu: Make stopping the trace optional 2020-03-24 13:45:24 +01:00
msu.h Merge 5.3-rc5 into char-misc-next 2019-08-19 07:11:53 +02:00
pci.c intel_th: pci: Add Emmitsburg PCH support 2020-07-10 15:12:48 +02:00
pti.c intel_th: pti: Use sysfs_match_string() helper 2019-02-21 15:04:36 +02:00
pti.h intel_th: Use the correct style for SPDX License Identifier 2019-07-30 19:41:53 +02:00
sth.c intel_th: Fix a NULL dereference when hub driver is not loaded 2020-07-10 15:12:48 +02:00
sth.h intel_th: Add SPDX GPL-2.0 header to replace GPLv2 boilerplate 2018-03-28 18:47:19 +03:00