Alexander Shishkin 8a9b2e08ed intel_th: Fix a NULL dereference when hub driver is not loaded ... commit e78e1fdb282726beaf88aa75943682217e6ded0e upstream. 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>		2020-07-22 09:32:12 +02:00
..
acpi.c
core.c	intel_th: Fix a NULL dereference when hub driver is not loaded	2020-07-22 09:32:12 +02:00
debug.c
debug.h
gth.c
gth.h
intel_th.h
Kconfig
Makefile
msu.c
msu.h
pci.c	intel_th: pci: Add Emmitsburg PCH support	2020-07-22 09:32:12 +02:00
pti.c
pti.h
sth.c	intel_th: Fix a NULL dereference when hub driver is not loaded	2020-07-22 09:32:12 +02:00
sth.h