sh_eth: fix kernel oops in skb_put()

[ Upstream commit 248be83dcb3feb3f6332eb3d010a016402138484 ]

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@atmark-techno.com>
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
index b2077ca..e49208d 100644 (file)
--- a/drivers/net/ethernet/renesas/sh_eth.c
+++ b/drivers/net/ethernet/renesas/sh_eth.c
@@ -911,6 +911,7 @@ static int sh_eth_rx(struct net_device *ndev)
                if (!(desc_status & RDFEND))
                        mdp->stats.rx_length_errors++;
 
+               skb = mdp->rx_skbuff[entry];
                if (desc_status & (RD_RFS1 | RD_RFS2 | RD_RFS3 | RD_RFS4 |
                                   RD_RFS5 | RD_RFS6 | RD_RFS10)) {
                        mdp->stats.rx_errors++;
@@ -926,12 +927,11 @@ static int sh_eth_rx(struct net_device *ndev)
                                mdp->stats.rx_missed_errors++;
                        if (desc_status & RD_RFS10)
                                mdp->stats.rx_over_errors++;
-               } else {
+               } else  if (skb) {
                        if (!mdp->cd->hw_swap)
                                sh_eth_soft_swap(
                                        phys_to_virt(ALIGN(rxdesc->addr, 4)),
                                        pkt_len + 2);
-                       skb = mdp->rx_skbuff[entry];
                        mdp->rx_skbuff[entry] = NULL;
                        if (mdp->cd->rpadir)
                                skb_reserve(skb, NET_IP_ALIGN);