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authorFlorian Fainelli <f.fainelli@gmail.com>2017-08-28 17:10:51 -0700
committerDavid S. Miller <davem@davemloft.net>2017-08-28 21:19:43 -0700
commitc7848399ec7612c2fa4dc0c2eeb9e0b89d00afef (patch)
tree11c0f2ebf5141801f4ecf3b82457f704f18baf52 /net/dsa
parentef9a5a62c63456cbba1beef2fc1372fce105fbbc (diff)
downloadlinux-c7848399ec7612c2fa4dc0c2eeb9e0b89d00afef.tar.bz2
net: dsa: Don't dereference dst->cpu_dp->netdev
If we do not have a master network device attached dst->cpu_dp will be NULL and accessing cpu_dp->netdev will create a trace similar to the one below. The correct check is on dst->cpu_dp period. [ 1.004650] DSA: switch 0 0 parsed [ 1.008078] Unable to handle kernel NULL pointer dereference at virtual address 00000010 [ 1.016195] pgd = c0003000 [ 1.018918] [00000010] *pgd=80000000004003, *pmd=00000000 [ 1.024349] Internal error: Oops: 206 [#1] SMP ARM [ 1.029157] Modules linked in: [ 1.032228] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.13.0-rc6-00071-g45b45afab9bd-dirty #7 [ 1.040772] Hardware name: Broadcom STB (Flattened Device Tree) [ 1.046704] task: ee08f840 task.stack: ee090000 [ 1.051258] PC is at dsa_register_switch+0x5e0/0x9dc [ 1.056234] LR is at dsa_register_switch+0x5d0/0x9dc [ 1.061211] pc : [<c08fb28c>] lr : [<c08fb27c>] psr: 60000213 [ 1.067491] sp : ee091d88 ip : 00000000 fp : 0000000c [ 1.072728] r10: 00000000 r9 : 00000001 r8 : ee208010 [ 1.077965] r7 : ee2b57b0 r6 : ee2b5780 r5 : 00000000 r4 : ee208e0c [ 1.084506] r3 : 00000000 r2 : 00040d00 r1 : 2d1b2000 r0 : 00000016 [ 1.091050] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user [ 1.098199] Control: 32c5387d Table: 00003000 DAC: fffffffd [ 1.103957] Process swapper/0 (pid: 1, stack limit = 0xee090210) Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Fixes: 6d3c8c0dd88a ("net: dsa: Remove master_netdev and use dst->cpu_dp->netdev") Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/dsa')
-rw-r--r--net/dsa/dsa2.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index c442051d5a55..20bc9c56fca0 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -577,7 +577,7 @@ static int dsa_dst_parse(struct dsa_switch_tree *dst)
return err;
}
- if (!dst->cpu_dp->netdev) {
+ if (!dst->cpu_dp) {
pr_warn("Tree has no master device\n");
return -EINVAL;
}