On Mon, Jun 28, 2021 at 10:17 AM Nicolas Iooss wrote:
> * lib/autoconf/c.m4: return an error when f is NULL.
> ---
> lib/autoconf/c.m4 | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/lib/autoconf/c.m4 b/lib/autoconf/c.m4
> index 9f881f0bc10c..0d9efa62d450 100644
> ---
The following program crashes (with a segmentation fault) when fopen
fails:
#include
int main () {
FILE *f = fopen ("conftest.out", "w");
return ferror (f) || fclose (f) != 0;
}
This is due to ferror dereferencing a NULL pointer (using GNU C Library
2.33).
*
