netdev - Re: [PATCH v3] sh_eth: fix kernel oops in skb

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Message-Id: <20151205.174648.1064779484509050839.davem@davemloft.net>
Date:	Sat, 05 Dec 2015 17:46:48 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	sergei.shtylyov@...entembedded.com
Cc:	netdev@...r.kernel.org, yashi@...ark-techno.com,
	linux-sh@...r.kernel.org
Subject: Re: [PATCH v3] sh_eth: fix kernel oops in skb_put()

From: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Date: Fri, 04 Dec 2015 01:45:40 +0300

> In a low memory situation the following kernel oops occurs:
> 
> Unable to handle kernel NULL pointer dereference at virtual address 00000050
> pgd = 8490c000
> [00000050] *pgd=4651e831, *pte=00000000, *ppte=00000000
> Internal error: Oops: 17 [#1] PREEMPT ARM
> Modules linked in:
> CPU: 0    Not tainted  (3.4-at16 #9)
> PC is at skb_put+0x10/0x98
> LR is at sh_eth_poll+0x2c8/0xa10
> pc : [<8035f780>]    lr : [<8028bf50>]    psr: 60000113
> sp : 84eb1a90  ip : 84eb1ac8  fp : 84eb1ac4
> r10: 0000003f  r9 : 000005ea  r8 : 00000000
> r7 : 00000000  r6 : 940453b0  r5 : 00030000  r4 : 9381b180
> r3 : 00000000  r2 : 00000000  r1 : 000005ea  r0 : 00000000
> Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
> Control: 10c53c7d  Table: 4248c059  DAC: 00000015
> Process klogd (pid: 2046, stack limit = 0x84eb02e8)
> [...]
> 
> This is  because netdev_alloc_skb() fails and 'mdp->rx_skbuff[entry]' is left
> NULL but sh_eth_rx() later  uses it without checking.  Add such check...
> 
> Reported-by: Yasushi SHOJI <yashi@...ark-techno.com>
> Signed-off-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>

Applied.
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