Re: [PATCH] pci: fix parsing of address without function number

["Gaëtan Rivet" <gaetan.rivet@6wind.com>]

On Mon, Nov 12, 2018 at 12:58:56AM +0100, Thomas Monjalon wrote:
> If the last part of the PCI address (function number) is missing,
> the parsing was successful, assuming function 0.
> The call to strtoul is not returning an error in such a case,
> so an explicit check is inserted before.
> 
> This bug has always been there in older parsing macros:
> 	- GET_PCIADDR_FIELD
> 	- GET_BLACKLIST_FIELD
> 

Returning 0, that's understandable, but errno not being set
is rather lame from strtoul.

> Fixes: af75078fece3 ("first public release")
> Cc: stable@dpdk.org
> 
> Reported-by: Wisam Jaddo <wisamm@mellanox.com>
> Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
Acked-by: Gaetan Rivet <gaetan.rivet@6wind.com>

> ---
>  lib/librte_pci/rte_pci.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/lib/librte_pci/rte_pci.c b/lib/librte_pci/rte_pci.c
> index 530738dbd..f400178bb 100644
> --- a/lib/librte_pci/rte_pci.c
> +++ b/lib/librte_pci/rte_pci.c
> @@ -30,6 +30,10 @@ get_u8_pciaddr_field(const char *in, void *_u8, char dlm)
>  	uint8_t *u8 = _u8;
>  	char *end;
>  
> +	/* empty string is an error though strtoul() returns 0 */
> +	if (*in == '\0')
> +		return NULL;
> +
>  	errno = 0;
>  	val = strtoul(in, &end, 16);
>  	if (errno != 0 || end[0] != dlm || val > UINT8_MAX) {
> -- 
> 2.19.0
> 

-- 
Gaëtan Rivet
6WIND