Merge v6.18.40linux-rolling-lts

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
index aa9c58bbf9d3..9409d32dce04 100644
--- a/tools/perf/util/thread.c
+++ b/tools/perf/util/thread.c
@@ -294,6 +294,11 @@ int thread__set_comm_from_proc(struct thread *thread)
 	if (!(snprintf(path, sizeof(path), "%d/task/%d/comm",
 		       thread__pid(thread), thread__tid(thread)) >= (int)sizeof(path)) &&
 	    procfs__read_str(path, &comm, &sz) == 0) {
+		/* sz==0: read got nothing, e.g. race during exit teardown */
+		if (sz == 0) {
+			free(comm);
+			return -1;
+		}
 		comm[sz - 1] = '\0';
 		err = thread__set_comm(thread, comm, 0);
 	}