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Date: Sat, 10 Jul 2021 12:50:50 -0400
From: Rich Felker <dalias@...c.org>
To: jason <jason@...omnia247.nl>
Cc: musl@...ts.openwall.com
Subject: Re: Bug in src/stdio/fread.c
On Sat, Jul 10, 2021 at 03:10:26PM +0200, jason wrote:
> If you look at the code:
>
> size_t fread(void *restrict destv, size_t size, size_t nmemb, FILE *restrict f)
> {
> unsigned char *dest = destv;
> size_t len = size*nmemb, l = len, k;
> if (!size) nmemb = 0;
>
> FLOCK(f);
>
> f->mode |= f->mode-1;
>
> if (f->rpos != f->rend) {
> /* First exhaust the buffer. */
> k = MIN(f->rend - f->rpos, l);
> memcpy(dest, f->rpos, k);
> f->rpos += k;
> dest += k;
> l -= k;
> }
>
> /* Read the remainder directly */
> for (; l; l-=k, dest+=k) {
> k = __toread(f) ? 0 : f->read(f, dest, l);
> if (!k) {
> FUNLOCK(f);
> return (len-l)/size;
> }
> }
>
> FUNLOCK(f);
> return nmemb;
> }
>
> Consider what happens when f->rpos == f->rend: k is used uninitialized.
At which line?
Rich
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