Vinay Belgaumkar 88aed0422f perf: Fix null pointer access in is_include_guest_event() ... A typical module unload occurring event when there is an active perf connection leads to freeing of the pmu pointer. The call log is something like: .. __pmu_detach_event pmu_detach_event pmu_detach_events perf_pmu_unregister .. __pmu_detach_event() sets event->pmu to null. When the perf connection finally is closed, the following stack trace is observed: Oops: general protection fault, kernel NULL pointer dereference ... RIP: 0010:_free_event+0x3e/0x370 ... Call Trace: ... perf_event_release_kernel+0x260/0x2d0 perf_release+0x12/0x20 A call to mediated_pmu_unaccount_event() inside _free_event() is the root cause of this crash. Adding a check inside is_include_guest_event() ensures we don't accidentally access a null pmu ptr. In addition to this, we will now call mediated_pmu_unaccount_event() before clearing the pmu ptr so that nr_include_guest_events counts are maintained correctly. Fixes: eff95e1702 ("perf: Add APIs to create/release mediated guest vPMUs") Assisted-by: Claude:Claude-Sonnet-5 Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar@intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Dapeng Mi <dapeng1.mi@linux.intel.com> Link: https://patch.msgid.link/20260904181625.1394082-1-vinay.belgaumkar@intel.com		2026-09-18 12:19:43 +02:00
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callchain.c
core.c	perf: Fix null pointer access in is_include_guest_event()	2026-09-18 12:19:43 +02:00
hw_breakpoint_test.c
hw_breakpoint.c
internal.h	perf/core: Fix deadlock in perf_mmap() failure path	2026-05-05 12:47:20 +02:00
Makefile
ring_buffer.c	perf/core: Skip empty AUX records with only format flags	2026-09-02 09:18:00 +02:00
uprobes.c	mm.git review status for linus..mm-stable	2026-08-27 09:17:06 -07:00