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
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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
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
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