netdev - RE: [PATCH iproute2] ss: Fix allocation of cong control alg name

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Date:	Fri, 29 May 2015 16:17:49 +0000
From:	"Guzman Mosqueda, Jose R" <jose.r.guzman.mosqueda@...el.com>
To:	Daniel Borkmann <daniel@...earbox.net>,
	Vadim Kochan <vadim4j@...il.com>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH iproute2] ss: Fix allocation of cong control alg name

Hi Daniel and Vadim

Thanks for your prompt response and for the patch.

Also, what about the other one? Do you think it is an issue or not?

" File: tc/tc_util.c
Function: void print_rate(char *buf, int len, __u64 rate)
Line: ~264

In the case that user inputs a high value for rate, the "for" loop will exit in the condition meaning that variable "i" get the value of 5 which will be an invalid index for the "units" array due to that array has only 5 elements."

I know a very high value is invalid but in the case that it comes directly from user, it could cause and issue, what do you think?

Thanks,
-José R.




-----Original Message-----
From: Daniel Borkmann [mailto:daniel@...earbox.net] 
Sent: Friday, May 29, 2015 6:10 AM
To: Vadim Kochan
Cc: netdev@...r.kernel.org; Guzman Mosqueda, Jose R
Subject: Re: [PATCH iproute2] ss: Fix allocation of cong control alg name

Hi Vadim,

On 05/29/2015 12:30 PM, Vadim Kochan wrote:
> From: Vadim Kochan <vadim4j@...il.com>
>
> Use strdup instead of malloc, and get rid of bad strcpy.
>
> Signed-off-by: Vadim Kochan <vadim4j@...il.com>

Please also Cc the reporter (done here), and add a:

Fixes: 8250bc9ff4e5 ("ss: Unify inet sockets output")
Reported-by: Jose R. Guzman Mosqueda <jose.r.guzman.mosqueda@...el.com>

Fixes tag is _very useful_ for distros to easily identify if additional follow-up commits would be needed when backporting the original change.
Then, this can be easily identified when going through the git log.

> ---
>   misc/ss.c | 3 +--
>   1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/misc/ss.c b/misc/ss.c
> index 347e3a1..a719466 100644
> --- a/misc/ss.c
> +++ b/misc/ss.c
> @@ -1908,8 +1908,7 @@ static void tcp_show_info(const struct nlmsghdr 
> *nlh, struct inet_diag_msg *r,
>
>   		if (tb[INET_DIAG_CONG]) {
>   			const char *cong_attr = rta_getattr_str(tb[INET_DIAG_CONG]);
> -			s.cong_alg = malloc(strlen(cong_attr + 1));
> -			strcpy(s.cong_alg, cong_attr);
> +			s.cong_alg = strdup(cong_attr);

strdup(3) can still return NULL.

>   		}
>
>   		if (TCPI_HAS_OPT(info, TCPI_OPT_WSCALE)) {
>

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