linux-kernel - Re: [PATCH v2] 9p/cache.c: Fix memory leak in v9fs_cache_session_get

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Message-ID: <20190522194733.GA4766@nautica>
Date:   Wed, 22 May 2019 21:47:33 +0200
From:   Dominique Martinet <asmadeus@...ewreck.org>
To:     Bharath Vedartham <linux.bhar@...il.com>
Cc:     ericvh@...il.com, lucho@...kov.net, linux-kernel@...r.kernel.org,
        v9fs-developer@...ts.sourceforge.net
Subject: Re: [PATCH v2] 9p/cache.c: Fix memory leak in
 v9fs_cache_session_get_cookie

Bharath Vedartham wrote on Thu, May 23, 2019:
> v9fs_cache_session_get_cookie assigns a random cachetag to v9ses->cachetag,
> if the cachetag is not assigned previously.
> 
> v9fs_random_cachetag allocates memory to v9ses->cachetag with kmalloc and uses
> scnprintf to fill it up with a cachetag.
> 
> But if scnprintf fails, v9ses->cachetag is not freed in the current
> code causing a memory leak.
> 
> Fix this by freeing v9ses->cachetag it v9fs_random_cachetag fails.
> 
> This was reported by syzbot, the link to the report is below:
> https://syzkaller.appspot.com/bug?id=f012bdf297a7a4c860c38a88b44fbee43fd9bbf3
> 
> Reported-by: syzbot+3a030a73b6c1e9833815@...kaller.appspotmail.com
> Signed-off-by: Bharath Vedartham <linux.bhar@...il.com>


Thanks!

I'm on limited internet right now but will run tests and queue this up tomorrow

-- 
Dominique