Re: [Help-smalltalk] [PATCH] gst-tool: Fix ASAN issue on comparing options

[Holger Freyther]

> On 8 Feb 2017, at 21:50, Holger Freyther <address@hidden> wrote:
> 


Hi!

> In case the name is longer than all_opts->name we would try to
> read past the string. Start using strncmp and strlen to make
> sure to fully consume all_opts->name and don't read out of
> bounds.

my inbox can't find this but I think we had this before? It is
triggered by ASAN right away.




> 
> 2017-02-08  Holger Hans Peter Freyther  <address@hidden>
> 
>       * gst-tool.c: Use strncmp instead of memcmp.
> ---
> ChangeLog  | 4 ++++
> gst-tool.c | 2 +-
> 2 files changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/ChangeLog b/ChangeLog
> index a40b68d..0542be5 100644
> --- a/ChangeLog
> +++ b/ChangeLog
> @@ -1,3 +1,7 @@
> +2017-02-08  Holger Hans Peter Freyther  <address@hidden>
> +
> +     * gst-tool.c: Use strncmp instead of memcmp.
> +
> 2015-11-07  Holger Hans Peter Freyther  <address@hidden>
> 
>       * build-aux/overflow-builtins.m4: Add new macro.
> diff --git a/gst-tool.c b/gst-tool.c
> index 1739793..8d817c4 100644
> --- a/gst-tool.c
> +++ b/gst-tool.c
> @@ -381,7 +381,7 @@ parse_long_option (const char *name, const char *arg)
>     len = p++ - name;
> 
>   for (all_opts = long_opts; all_opts; all_opts = all_opts->next)
> -    if (!memcmp (name, all_opts->name, len))
> +    if (strlen(all_opts->name) >= len && !strncmp (name, all_opts->name, 
> len))
>       {
>       opt = all_opts;
>       if (opt->name[len] == '\0')
> -- 
> 2.10.2
> 
> 
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