[PATCH] Input: fix oops in input_to_handler
From: Zhipeng Xie
Date: Thu Feb 28 2019 - 22:45:46 EST
we got the following boot crash:
[ 36.086344] Internal error: Oops: 96000004 [#1] SMP
[ 36.091371] CPU: 32 PID: 0 Comm: swapper/32 Tainted: G OE 4.19.25-vhulk1901.1.0.h111.aarch64 #1
[ 36.101444] Hardware name: Huawei TaiShan 2280 /BC11SPCD, BIOS 1.58 10/24/2018
[ 36.108860] pstate: 20000085 (nzCv daIf -PAN -UAO)
[ 36.113727] pc : input_to_handler+0x2c/0x148
[ 36.118058] lr : input_pass_values.part.2+0x148/0x168
[ 36.123177] sp : ffff000100103ba0
[ 36.126535] x29: ffff000100103ba0 x28: ffff801fb2ac5958
[ 36.131924] x27: ffff000009799000 x26: 0000000000000001
[ 36.137375] x25: 0000000000000000 x24: ffff801fb5b57c00
[ 36.142822] x23: 000000020987f3d0 x22: ffff801faf427e00
[ 36.148211] x21: 0000000000000003 x20: 0000000000000003
[ 36.153599] x19: ffff801faf427e00 x18: 000000000000000e
[ 36.158986] x17: 000000000000000e x16: 0000000000000007
[ 36.164374] x15: 0000000000000001 x14: 0000000000000019
[ 36.169762] x13: 0000000000000033 x12: 000000000000004c
[ 36.175150] x11: 0000000000000068 x10: ffff000008dfa290
[ 36.180538] x9 : 000000000000007d x8 : 0000000000000000
[ 36.185925] x7 : 0000000000000053 x6 : 0000000000000000
[ 36.191313] x5 : 0000000000000000 x4 : 0000000000000000
[ 36.196700] x3 : 0000000000000010 x2 : 0000000000000003
[ 36.202088] x1 : ffff801fb5b57c00 x0 : ffff000008a120a0
[ 36.207477] Process swapper/32 (pid: 0, stack limit = 0x0000000032f86b58)
[ 36.214361] Call trace:
[ 36.216840] input_to_handler+0x2c/0x148
[ 36.220816] input_pass_values.part.2+0x148/0x168
[ 36.225582] input_handle_event+0x130/0x5b8
[ 36.229823] i6.242013] hid_input_report+0x128/0x1b0
[ 36.246076] hid_irq_in+0x240/0x298
[ 36.249613] __usb_hcd_giveback_urb+0x9c/0x130
[ 36.257460] usb_giveback_urb_bh+0xf4/0x198
[ 36.265127] tasklet_action_common.isra.6+0x94/0x160
[ 36.273458] tasklet_hi_action+0x2c/0x38
[ 36.280597] __do_softirq+0x118/0x314
[ 36.287494] irq_exit+0xa4/0xe8
[ 36.293682] __handle_domain_irq+0x6c/0xc0
[ 36.300783] gic_handle_irq+0x6c/0x170
[ 36.307296] el1_irq+0xb8/0x140
[ 36.313283] arch_cpu_idle+0x38/0x1c0
[ 36.319776] default_idle_call+0x24/0x44
[ 36.326527] do_idle+0x1ec/0x2d0
[ 36.332503] cpu_startup_entry+0x28/0x30
[ 36.339161] secondary_start_kernel+0x194/0x1d8
We need to check the input_handler before referencing its members.
Signed-off-by: Zhipeng Xie <xiezhipeng1@xxxxxxxxxx>
---
drivers/input/input.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/input/input.c b/drivers/input/input.c
index 3304aaa..b768d14 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -100,6 +100,9 @@ static unsigned int input_to_handler(struct input_handle *handle,
struct input_value *end = vals;
struct input_value *v;
+ if (!handler)
+ return 0;
+
if (handler->filter) {
for (v = vals; v != vals + count; v++) {
if (handler->filter(handle, v->type, v->code, v->value))
--
1.7.12.4