[PATCH] Fix PR 19089: Environment variable TMP may yield gcc: abort

[Jeff Law]

On 11/27/2021 7:49 PM, apinski--- via Gcc-patches wrote:
> From: Andrew Pinski <apinski@marvell.com>
>
> Even though I cannot reproduce the ICE any more, this is still
> a bug. We check already to see if we can access the directory
> but never check to see if the path is actually a directory.
>
> This adds the check and now we reject the file as not usable
> as a tmp directory.
>
> OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions.
>
> libiberty/ChangeLog:
>
> 	* make-temp-file.c (try_dir): Check to see if the dir
> 	is actually a directory.
> ---
>   libiberty/make-temp-file.c | 16 +++++++++++++++-
>   1 file changed, 15 insertions(+), 1 deletion(-)
>
> diff --git a/libiberty/make-temp-file.c b/libiberty/make-temp-file.c
> index 31f87fbcfde..11eb03d12ec 100644
> --- a/libiberty/make-temp-file.c
> +++ b/libiberty/make-temp-file.c
> @@ -39,6 +39,10 @@ Boston, MA 02110-1301, USA.  */
>   #if defined(_WIN32) && !defined(__CYGWIN__)
>   #include <windows.h>
>   #endif
> +#if HAVE_SYS_STAT_H
> +#include <sys/stat.h>
> +#endif
> +
>   
>   #ifndef R_OK
>   #define R_OK 4
> @@ -76,7 +80,17 @@ try_dir (const char *dir, const char *base)
>       return base;
>     if (dir != 0
>         && access (dir, R_OK | W_OK | X_OK) == 0)
> -    return dir;
> +    {
> +      /* Check to make sure dir is actually a directory. */
> +#ifdef S_ISDIR
> +      struct stat s;
> +      if (stat(dir, &s))
Formatting nit, missing whitespace between stat and open paren.

Presumably this doesn't fix the problem in the case where S_ISDIR is not 
defined.  But it's still an improvement.  OK with the nit fixed.

jeff