Re: [Qemu-devel] [Qemu-trivial] [PATCH 5/7] cutils: refine strtol error handling in parse_debug_env

[Michael Tokarev <mjt@tls.msk.ru>]

26.01.2015 14:12, Paolo Bonzini wrote:
> Avoid truncation of a 64-bit long to a 32-bit int, and check for errno
> (especially ERANGE).
> 
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
>  util/cutils.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/util/cutils.c b/util/cutils.c
> index dbe7412..f227064 100644
> --- a/util/cutils.c
> +++ b/util/cutils.c
> @@ -523,7 +523,7 @@ int parse_debug_env(const char *name, int max, int initial)
>  {
>      char *debug_env = getenv(name);
>      char *inv = NULL;
> -    int debug;
> +    long debug;
>  
>      if (!debug_env) {
>          return initial;
> @@ -532,7 +532,7 @@ int parse_debug_env(const char *name, int max, int initial)
>      if (inv == debug_env) {
>          return initial;
>      }
> -    if (debug < 0 || debug > max) {
> +    if (debug < 0 || debug > max || errno != 0) {

It is not really right to check errno without (re)setting it
before call to strtol().

Thanks,

/mjt