[PATCH v5 4/6] trace-cmd library: Fix possible memory leak in read_ftrace_files()

["Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com>]

Some error paths in read_ftrace_files() may lead to a memory leak.
Improved the error handling of this internal function to avoid it.

Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
---
 lib/trace-cmd/trace-input.c | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/lib/trace-cmd/trace-input.c b/lib/trace-cmd/trace-input.c
index f9dd0784..edf84993 100644
--- a/lib/trace-cmd/trace-input.c
+++ b/lib/trace-cmd/trace-input.c
@@ -618,28 +618,30 @@ static int read_ftrace_files(struct tracecmd_input *handle, const char *regex)
 		}
 	}
 
-	if (read4(handle, &count) < 0)
-		return -1;
+	ret = read4(handle, &count);
+	if (ret < 0)
+		goto out;
 
 	for (i = 0; i < count; i++) {
-		if (read8(handle, &size) < 0)
-			return -1;
+		ret = read8(handle, &size);
+		if (ret < 0)
+			goto out;
 		ret = read_ftrace_file(handle, size, print_all, ereg);
 		if (ret < 0)
-			return -1;
+			goto out;
 	}
 
 	handle->event_files_start =
 		lseek64(handle->fd, 0, SEEK_CUR);
-
+	handle->file_state = TRACECMD_FILE_FTRACE_EVENTS;
+	ret = 0;
+out:
 	if (sreg) {
 		regfree(sreg);
 		regfree(ereg);
 	}
 
-	handle->file_state = TRACECMD_FILE_FTRACE_EVENTS;
-
-	return 0;
+	return ret;
 }
 
 static int read_event_files(struct tracecmd_input *handle, const char *regex)
-- 
2.33.1