linux-ext4 - Re: [PATCH] Don't dereference NULL upon slashless module dependency line.

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Date:	Thu, 26 Feb 2009 16:18:29 -0600
From:	Eric Sandeen <sandeen@...hat.com>
To:	Jim Meyering <jim@...ering.net>
CC:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH] Don't dereference NULL upon slashless module dependency
 line.

Jim Meyering wrote:
> * probe.c (check_for_modules): Skip current line if it has no slash.
> 
> Signed-off-by: Jim Meyering <meyering@...hat.com>
> ---
> I found this by inspection while looking for the cause of
> a recent rawhide/nash segfault.
> 
>  lib/blkid/probe.c |    5 +++--
>  1 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/lib/blkid/probe.c b/lib/blkid/probe.c
> index 76763ae..f5fff6b 100644
> --- a/lib/blkid/probe.c
> +++ b/lib/blkid/probe.c
> @@ -225,8 +225,9 @@ static int check_for_modules(const char *fs_name)
>  			*cp = 0;
>  		else
>  			continue;
> -		if ((cp = strrchr(buf, '/')) != NULL)
> -			cp++;
> +		if ((cp = strrchr(buf, '/')) == NULL)
> +			continue;
> +		cp++;
>  		i = strlen(cp);
>  		if (i > 3) {
>  			t = cp + i - 3;
> --

oops, I missed that Jim sent this (or just didn't remember w/ my
goldfish brain)

OTOH the other patch I sent is probably a bit better, it gets both
pieces of duplicated(!) code, and doeesn't skip these lines in
modules.dep, it just skips the pre-"/"-stripping ...

-Eric
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