On 4/16/19, Michael Niedermayer <mich...@niedermayer.cc> wrote:
> The function in case of n=0 would read more bytes than 0.
> The end pointer could be beyond the allocated space, which
> is undefined.
>
> Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
> ---
> libavutil/avstring.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/libavutil/avstring.c b/libavutil/avstring.c
> index f03dd25141..4c068f5bc5 100644
> --- a/libavutil/avstring.c
> +++ b/libavutil/avstring.c
> @@ -222,12 +222,13 @@ int av_strcasecmp(const char *a, const char *b)
>
> int av_strncasecmp(const char *a, const char *b, size_t n)
> {
> - const char *end = a + n;
> uint8_t c1, c2;
> + if (n <= 0)
> + return 0;
> do {
> c1 = av_tolower(*a++);
> c2 = av_tolower(*b++);
> - } while (a < end && c1 && c1 == c2);
> + } while (--n && c1 && c1 == c2);
> return c1 - c2;
> }
>
> --
> 2.21.0
>
LGTM
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