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[v4,1/5] tracing/kprobes: Fix to free objects when failed to copy a symbol

Message ID 173629944700.1450013.2866967127814543723.stgit@devnote2 (mailing list archive)
State Superseded
Headers show
Series tracing/probes: Cleanup with guard and __free for kprobe and fprobe | expand

Commit Message

Masami Hiramatsu (Google) Jan. 8, 2025, 1:24 a.m. UTC 
From: Masami Hiramatsu (Google) <mhiramat@kernel.org>

In __trace_kprobe_create(), if something fails it must goto error block
to free objects. But when strdup() a symbol, it returns without that.
Fix it to goto the error block to free objects correctly.

Fixes: 6212dd29683e ("tracing/kprobes: Use dyn_event framework for kprobe events")
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
---
 kernel/trace/trace_kprobe.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
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Patch

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 263fac44d3ca..fb9d4dffa66e 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -940,8 +940,10 @@  static int __trace_kprobe_create(int argc, const char *argv[])
 		}
 		/* a symbol specified */
 		symbol = kstrdup(argv[1], GFP_KERNEL);
-		if (!symbol)
-			return -ENOMEM;
+		if (!symbol) {
+			ret = -ENOMEM;
+			goto error;
+		}
 
 		tmp = strchr(symbol, '%');
 		if (tmp) {