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authorIan Rogers <[email protected]>2024-05-07 20:53:01 -0700
committerArnaldo Carvalho de Melo <[email protected]>2024-05-09 18:15:25 -0300
commit3536c2575e88a890cf696b4ccd3da36bc937853b (patch)
tree8f7ea0af72008461cd825e7b98a34e1449155533
parent45b4f402a6b782352c4bafcff682bfb01da9ca05 (diff)
perf thread: Fixes to thread__new() related to initializing comm
Freeing the thread on failure won't work with reference count checking, use thread__delete(). Don't allocate the comm_str, use a stack allocation instead. Fixes: f6005cafebab72f8 ("perf thread: Add reference count checking") Signed-off-by: Ian Rogers <[email protected]> Cc: Adrian Hunter <[email protected]> Cc: Alexander Shishkin <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: James Clark <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Kan Liang <[email protected]> Cc: Leo Yan <[email protected]> Cc: Mark Rutland <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Peter Zijlstra <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
-rw-r--r--tools/perf/util/thread.c14
1 files changed, 5 insertions, 9 deletions
diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
index 0a473112f881..87c59aa9fe38 100644
--- a/tools/perf/util/thread.c
+++ b/tools/perf/util/thread.c
@@ -39,12 +39,13 @@ int thread__init_maps(struct thread *thread, struct machine *machine)
struct thread *thread__new(pid_t pid, pid_t tid)
{
- char *comm_str;
- struct comm *comm;
RC_STRUCT(thread) *_thread = zalloc(sizeof(*_thread));
struct thread *thread;
if (ADD_RC_CHK(thread, _thread) != NULL) {
+ struct comm *comm;
+ char comm_str[32];
+
thread__set_pid(thread, pid);
thread__set_tid(thread, tid);
thread__set_ppid(thread, -1);
@@ -56,13 +57,8 @@ struct thread *thread__new(pid_t pid, pid_t tid)
init_rwsem(thread__namespaces_lock(thread));
init_rwsem(thread__comm_lock(thread));
- comm_str = malloc(32);
- if (!comm_str)
- goto err_thread;
-
- snprintf(comm_str, 32, ":%d", tid);
+ snprintf(comm_str, sizeof(comm_str), ":%d", tid);
comm = comm__new(comm_str, 0, false);
- free(comm_str);
if (!comm)
goto err_thread;
@@ -76,7 +72,7 @@ struct thread *thread__new(pid_t pid, pid_t tid)
return thread;
err_thread:
- free(thread);
+ thread__delete(thread);
return NULL;
}