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author | Thomas Richter <tmricht@linux.ibm.com> | 2021-04-21 14:04:00 +0200 |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2021-04-23 20:58:10 +0200 |
commit | 671b60cb6a897a5b3832fe57657152f2c3995e25 (patch) | |
tree | 28610ba75f44500ac3414fc709df491d5d76fc9a /.gitignore | |
parent | perf auxtrace: Fix potential NULL pointer dereference (diff) | |
download | linux-671b60cb6a897a5b3832fe57657152f2c3995e25.tar.xz linux-671b60cb6a897a5b3832fe57657152f2c3995e25.zip |
perf ftrace: Fix access to pid in array when setting a pid filter
Command 'perf ftrace -v -- ls' fails in s390 (at least 5.12.0rc6).
The root cause is a missing pointer dereference which causes an
array element address to be used as PID.
Fix this by extracting the PID.
Output before:
# ./perf ftrace -v -- ls
function_graph tracer is used
write '-263732416' to tracing/set_ftrace_pid failed: Invalid argument
failed to set ftrace pid
#
Output after:
./perf ftrace -v -- ls
function_graph tracer is used
# tracer: function_graph
#
# CPU DURATION FUNCTION CALLS
# | | | | | | |
4) | rcu_read_lock_sched_held() {
4) 0.552 us | rcu_lockdep_current_cpu_online();
4) 6.124 us | }
Reported-by: Alexander Schmidt <alexschm@de.ibm.com>
Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Sumanth Korikkar <sumanthk@linux.ibm.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Link: http://lore.kernel.org/lkml/20210421120400.2126433-1-tmricht@linux.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to '.gitignore')
0 files changed, 0 insertions, 0 deletions