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From: Sascha Hauer <sha@pengutronix.de>
To: Ahmad Fatoum <ahmad@a3f.at>
Cc: barebox@lists.infradead.org, Xogium <contact@xogium.me>
Subject: Re: [PATCH master v2] fs: fix NULL pointer dereference of fsdrv->truncate for read-only FS
Date: Fri, 9 Jul 2021 22:54:07 +0200	[thread overview]
Message-ID: <20210709205407.GC9782@pengutronix.de> (raw)
In-Reply-To: <20210707065251.760827-1-ahmad@a3f.at>

On Wed, Jul 07, 2021 at 08:52:51AM +0200, Ahmad Fatoum wrote:
> fsdrv->truncate is dereferenced at times without checking for NULL before,
> leading to crashes, e.g. doing:
> 
>   edit -o /mnt/myext4/FILE some text
> 
> on ext4 crashes. Fix this by returning -EROFS when truncate is unimplemented.
> 
> Reported-by: Xogium <contact@xogium.me>
> Signed-off-by: Ahmad Fatoum <ahmad@a3f.at>
> ---
> v1 -> v2:
>   - use dev parameter instead of going through &f->fsdev->dev.
>     No functional change, but makes diff easier to verify.
> ---
>  fs/fs.c | 16 ++++++++++------
>  1 file changed, 10 insertions(+), 6 deletions(-)

Applied, thanks

Sascha

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      reply	other threads:[~2021-07-09 20:56 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-07  6:52 Ahmad Fatoum
2021-07-09 20:54 ` Sascha Hauer [this message]

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