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ftrace: Fix regression with module command in stack_trace_filter

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When executing the following command:

    # echo "write*:mod:ext3" > /sys/kernel/tracing/stack_trace_filter

The current mod command causes a null pointer dereference. While commit
0f17976568 ("ftrace: Fix regression with module command in stack_trace_filter")
has addressed part of the issue, it left a corner case unhandled, which still
results in a kernel crash.

Cc: stable@vger.kernel.org
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://lore.kernel.org/20241120052750.275463-1-guoweikang.kernel@gmail.com
Fixes: 04ec7bb642 ("tracing: Have the trace_array hold the list of registered func probes");
Signed-off-by: guoweikang <guoweikang.kernel@gmail.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
guoweikang 2024-11-20 13:27:49 +08:00 committed by Steven Rostedt (Google)
parent 6ce5a6f0a0
commit 45af52e7d3
1 changed files with 3 additions and 0 deletions
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3
kernel/trace/ftrace.c
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@ -5076,6 +5076,9 @@ ftrace_mod_callback(struct trace_array *tr, struct ftrace_hash *hash,
char *func; char *func;
int ret; int ret;
if (!tr)
return -ENODEV;
/* match_records() modifies func, and we need the original */ /* match_records() modifies func, and we need the original */
func = kstrdup(func_orig, GFP_KERNEL); func = kstrdup(func_orig, GFP_KERNEL);
if (!func) if (!func)