[PATCH] replace: count_strstr - Handle an edge case where sub is empty
Denys Vlasenko
vda.linux at googlemail.com
Thu Oct 10 12:53:01 UTC 2019
Applied, thanks
On Sun, Sep 15, 2019 at 6:52 PM Martin Lewis <martin.lewis.x84 at gmail.com> wrote:
>
> If sub is empty, avoids an infinite loop.
>
> Signed-off-by: Martin Lewis <martin.lewis.x84 at gmail.com>
> ---
> libbb/replace.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/libbb/replace.c b/libbb/replace.c
> index a661d96..6183d3e 100644
> --- a/libbb/replace.c
> +++ b/libbb/replace.c
> @@ -11,14 +11,18 @@
> #include "libbb.h"
>
> unsigned FAST_FUNC count_strstr(const char *str, const char *sub)
> {
> size_t sub_len = strlen(sub);
> unsigned count = 0;
>
> + /* If sub is empty, avoid an infinite loop */
> + if (sub_len == 0)
> + return strlen(str) + 1;
> +
> while ((str = strstr(str, sub)) != NULL) {
> count++;
> str += sub_len;
> }
> return count;
> }
>
> --
> 1.9.1
>
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