linux-ext4 - Re: [PATCH v2 1/2] e2p: Fix segfault in e2p

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Date:   Tue, 18 Jul 2017 16:32:24 -0600
From:   Andreas Dilger <adilger@...ger.ca>
To:     Adam Buchbinder <abuchbinder@...gle.com>
Cc:     Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] e2p: Fix segfault in e2p_os2string.


> On Jul 18, 2017, at 3:48 PM, Adam Buchbinder <abuchbinder@...gle.com> wrote:
> 
> Passing in a negative integer would lead to a segfault, and
> a crafted filesystem image could trigger that.
> 
> Signed-off-by: Adam Buchbinder <abuchbinder@...gle.com>

Reviewed-by: Andreas Dilger <adilger@...ger.ca>

> ---
> lib/e2p/ostype.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/lib/e2p/ostype.c b/lib/e2p/ostype.c
> index 7f088446..c5fd8ab3 100644
> --- a/lib/e2p/ostype.c
> +++ b/lib/e2p/ostype.c
> @@ -30,7 +30,7 @@ char *e2p_os2string(int os_type)
>         const char	*os;
> 	char 		*ret;
> 
> -	if (os_type <= EXT2_OS_LITES)
> +	if (os_type >= 0 && os_type <= EXT2_OS_LITES)
> 		os = os_tab[os_type];
> 	else
> 		os = "(unknown os)";
> --
> 2.14.0.rc0.284.gd933b75aa4-goog
> 


Cheers, Andreas






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