Re: [PATCH 15/38] trace-cmd lib: check the return value of do_lssek() in trace_get_options()

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On 17/07/2024 23:10, Steven Rostedt wrote:

Note the subject has a typo "lssek".


On Wed,  5 Jun 2024 15:40:30 +0200
"Jerome Marchand" <jmarchan@xxxxxxxxxx> wrote:

Check that do_lseek doesn't fail before calling malloc() with a -1
argument.

This is flagged as an overrun error (CWE-119) by static anaysis
because of the call to read() later, but I don't imagine that malloc
would succeed.

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

diff --git a/lib/trace-cmd/trace-output.c b/lib/trace-cmd/trace-output.c
index 5ba0a145..35904620 100644
--- a/lib/trace-cmd/trace-output.c
+++ b/lib/trace-cmd/trace-output.c
@@ -2069,6 +2069,8 @@ __hidden void *trace_get_options(struct tracecmd_output *handle, size_t *len)
  	}
offset = do_lseek(&out_handle, 0, SEEK_CUR);
+	if(offset == (off_t)-1)

Nit, the above has whitespace issues:

	if (offset == (off_t)-1)

Could you resend this?

Will do.

Jerome


Thanks,

-- Steve

+		goto out;
  	buf = malloc(offset);
  	if (!buf)
  		goto out;






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