Mark Rutland 9d7f2619b0 perf: Correctly handle failed perf_get_aux_event() ... commit da9ec3d3dd upstream. Vince reports a worrying issue: | so I was tracking down some odd behavior in the perf_fuzzer which turns | out to be because perf_even_open() sometimes returns 0 (indicating a file | descriptor of 0) even though as far as I can tell stdin is still open. ... and further the cause: | error is triggered if aux_sample_size has non-zero value. | | seems to be this line in kernel/events/core.c: | | if (perf_need_aux_event(event) && !perf_get_aux_event(event, group_leader)) | goto err_locked; | | (note, err is never set) This seems to be a thinko in commit: ab43762ef0 ("perf: Allow normal events to output AUX data") ... and we should probably return -EINVAL here, as this should only happen when the new event is mis-configured or does not have a compatible aux_event group leader. Fixes: ab43762ef0 ("perf: Allow normal events to output AUX data") Reported-by: Vince Weaver <vincent.weaver@maine.edu> Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Acked-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Tested-by: Vince Weaver <vincent.weaver@maine.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2020-01-23 08:22:33 +01:00
..
Makefile	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
callchain.c	perf/core: Convert to SPDX license identifiers	2019-02-04 08:46:11 +01:00
core.c	perf: Correctly handle failed perf_get_aux_event()	2020-01-23 08:22:33 +01:00
hw_breakpoint.c	perf/hw_breakpoint: Fix arch_hw_breakpoint use-before-initialization	2019-09-06 08:24:01 +02:00
internal.h	perf/ring-buffer: Use regular variables for nesting	2019-05-24 09:00:11 +02:00
ring_buffer.c	perf/ring-buffer: Use regular variables for nesting	2019-05-24 09:00:11 +02:00
uprobes.c	kernel/events/uprobes.c: only do FOLL_SPLIT_PMD for uprobe register	2019-10-19 06:32:33 -04:00