Re: [PATCH 08/38] trace-cmd lib: prevent a memory leak in create_event_list_item()

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Hi Steven,

Sorry for the long delay. I was on PTO and then this got at the bottom of my pile.

On 17/07/2024 22:31, Steven Rostedt wrote:
On Wed,  5 Jun 2024 15:40:23 +0200
"Jerome Marchand" <jmarchan@xxxxxxxxxx> wrote:

Free ptr if malloc() fails.

Fixes a RESOURCE_LEAK error (CWE-772)

Signed-off-by: Jerome Marchand <jmarchan@xxxxxxxxxx>
---
  lib/trace-cmd/trace-output.c | 3 ++-
  1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/trace-cmd/trace-output.c b/lib/trace-cmd/trace-output.c
index 59498edc..4a9ecc5d 100644
--- a/lib/trace-cmd/trace-output.c
+++ b/lib/trace-cmd/trace-output.c
@@ -955,7 +955,8 @@ create_event_list_item(struct tracecmd_output *handle,
  	free(str);
  	return;
   err_mem:
-	 tracecmd_warning("Insufficient memory");
+	free(ptr);
+	tracecmd_warning("Insufficient memory");

This function starts with:

	char *ptr;
	char *str;

	str = strdup(list->glob);
	if (!str)
		goto err_mem;

Where ptr is not defined yet.

I'm going to skip this patch.

After taking an other look at this, it looks like it was a false positive of the static analyzer anyway.

Jerome


-- Steve

  }
static int read_ftrace_files(struct tracecmd_output *handle, bool compress)






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