* [PATCH] of: platform: stop accessing invalid dev in of_platform_device_destroy
@ 2018-06-01 22:58 ` Srinivas Kandagatla
0 siblings, 0 replies; 4+ messages in thread
From: Srinivas Kandagatla @ 2018-06-01 22:58 UTC (permalink / raw)
To: robh+dt, frowand.list
Cc: linux-arm-msm, bgoswami, devicetree, linux-kernel,
linux-arm-kernel, rohkumar, Srinivas Kandagatla
Immediately after the platform_device_unregister() the device will be cleaned up.
Accessing the freed pointer immediately after that will crash the system.
Found this bug when kernel is built with CONFIG_PAGE_POISONING and testing
loading/unloading audio drivers in a loop on Qcom platforms.
Fix this by removing accessing the dev pointer.
Below is the carsh trace:
Unable to handle kernel paging request at virtual address 6b6b6b6b6b6c03
Mem abort info:
ESR = 0x96000021
Exception class = DABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
Data abort info:
ISV = 0, ISS = 0x00000021
CM = 0, WnR = 0
[006b6b6b6b6b6c03] address between user and kernel address ranges
Internal error: Oops: 96000021 [#1] PREEMPT SMP
Modules linked in:
CPU: 2 PID: 1784 Comm: sh Tainted: G W 4.17.0-rc7-02230-ge3a63a7ef641-dirty #204
Hardware name: Qualcomm Technologies, Inc. APQ 8016 SBC (DT)
pstate: 80000005 (Nzcv daif -PAN -UAO)
pc : clear_bit+0x18/0x2c
lr : of_platform_device_destroy+0x64/0xb8
sp : ffff00000c9c3930
x29: ffff00000c9c3930 x28: ffff80003d39b200
x27: ffff000008bb1000 x26: 0000000000000040
x25: 0000000000000124 x24: ffff80003a9a3080
x23: 0000000000000060 x22: ffff00000939f518
x21: ffff80003aa79e98 x20: ffff80003aa3dae0
x19: ffff80003aa3c890 x18: ffff800009feb794
x17: 0000000000000000 x16: 0000000000000000
x15: ffff800009feb790 x14: 0000000000000000
x13: ffff80003a058778 x12: ffff80003a058728
x11: ffff80003a058750 x10: 0000000000000000
x9 : 0000000000000006 x8 : ffff80003a825988
x7 : bbbbbbbbbbbbbbbb x6 : 0000000000000001
x5 : 0000000000000000 x4 : 0000000000000001
x3 : 0000000000000008 x2 : 0000000000000001
x1 : 6b6b6b6b6b6b6c03 x0 : 0000000000000000
Process sh (pid: 1784, stack limit = 0x (ptrval))
Call trace:
clear_bit+0x18/0x2c
q6afe_remove+0x20/0x38
apr_device_remove+0x30/0x70
device_release_driver_internal+0x170/0x208
device_release_driver+0x14/0x20
bus_remove_device+0xcc/0x150
device_del+0x10c/0x310
device_unregister+0x1c/0x70
apr_remove_device+0xc/0x18
device_for_each_child+0x50/0x80
apr_remove+0x18/0x20
rpmsg_dev_remove+0x38/0x68
device_release_driver_internal+0x170/0x208
device_release_driver+0x14/0x20
bus_remove_device+0xcc/0x150
device_del+0x10c/0x310
device_unregister+0x1c/0x70
qcom_smd_remove_device+0xc/0x18
device_for_each_child+0x50/0x80
qcom_smd_unregister_edge+0x3c/0x70
smd_subdev_remove+0x18/0x28
rproc_stop+0x48/0xd8
rproc_shutdown+0x60/0xe8
state_store+0xbc/0xf8
dev_attr_store+0x18/0x28
sysfs_kf_write+0x3c/0x50
kernfs_fop_write+0x118/0x1e0
__vfs_write+0x18/0x110
vfs_write+0xa4/0x1a8
ksys_write+0x48/0xb0
sys_write+0xc/0x18
el0_svc_naked+0x30/0x34
Code: d2800022 8b400c21 f9800031 9ac32043 (c85f7c22)
---[ end trace 32020935775616a2 ]---
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
---
drivers/of/platform.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index c00d81dfac0b..78c32b93c0e7 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -544,8 +544,6 @@ int of_platform_device_destroy(struct device *dev, void *data)
amba_device_unregister(to_amba_device(dev));
#endif
- of_node_clear_flag(dev->of_node, OF_POPULATED);
- of_node_clear_flag(dev->of_node, OF_POPULATED_BUS);
return 0;
}
EXPORT_SYMBOL_GPL(of_platform_device_destroy);
--
2.16.2
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH] of: platform: stop accessing invalid dev in of_platform_device_destroy
@ 2018-06-01 22:58 ` Srinivas Kandagatla
0 siblings, 0 replies; 4+ messages in thread
From: Srinivas Kandagatla @ 2018-06-01 22:58 UTC (permalink / raw)
To: linux-arm-kernel
Immediately after the platform_device_unregister() the device will be cleaned up.
Accessing the freed pointer immediately after that will crash the system.
Found this bug when kernel is built with CONFIG_PAGE_POISONING and testing
loading/unloading audio drivers in a loop on Qcom platforms.
Fix this by removing accessing the dev pointer.
Below is the carsh trace:
Unable to handle kernel paging request at virtual address 6b6b6b6b6b6c03
Mem abort info:
ESR = 0x96000021
Exception class = DABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
Data abort info:
ISV = 0, ISS = 0x00000021
CM = 0, WnR = 0
[006b6b6b6b6b6c03] address between user and kernel address ranges
Internal error: Oops: 96000021 [#1] PREEMPT SMP
Modules linked in:
CPU: 2 PID: 1784 Comm: sh Tainted: G W 4.17.0-rc7-02230-ge3a63a7ef641-dirty #204
Hardware name: Qualcomm Technologies, Inc. APQ 8016 SBC (DT)
pstate: 80000005 (Nzcv daif -PAN -UAO)
pc : clear_bit+0x18/0x2c
lr : of_platform_device_destroy+0x64/0xb8
sp : ffff00000c9c3930
x29: ffff00000c9c3930 x28: ffff80003d39b200
x27: ffff000008bb1000 x26: 0000000000000040
x25: 0000000000000124 x24: ffff80003a9a3080
x23: 0000000000000060 x22: ffff00000939f518
x21: ffff80003aa79e98 x20: ffff80003aa3dae0
x19: ffff80003aa3c890 x18: ffff800009feb794
x17: 0000000000000000 x16: 0000000000000000
x15: ffff800009feb790 x14: 0000000000000000
x13: ffff80003a058778 x12: ffff80003a058728
x11: ffff80003a058750 x10: 0000000000000000
x9 : 0000000000000006 x8 : ffff80003a825988
x7 : bbbbbbbbbbbbbbbb x6 : 0000000000000001
x5 : 0000000000000000 x4 : 0000000000000001
x3 : 0000000000000008 x2 : 0000000000000001
x1 : 6b6b6b6b6b6b6c03 x0 : 0000000000000000
Process sh (pid: 1784, stack limit = 0x (ptrval))
Call trace:
clear_bit+0x18/0x2c
q6afe_remove+0x20/0x38
apr_device_remove+0x30/0x70
device_release_driver_internal+0x170/0x208
device_release_driver+0x14/0x20
bus_remove_device+0xcc/0x150
device_del+0x10c/0x310
device_unregister+0x1c/0x70
apr_remove_device+0xc/0x18
device_for_each_child+0x50/0x80
apr_remove+0x18/0x20
rpmsg_dev_remove+0x38/0x68
device_release_driver_internal+0x170/0x208
device_release_driver+0x14/0x20
bus_remove_device+0xcc/0x150
device_del+0x10c/0x310
device_unregister+0x1c/0x70
qcom_smd_remove_device+0xc/0x18
device_for_each_child+0x50/0x80
qcom_smd_unregister_edge+0x3c/0x70
smd_subdev_remove+0x18/0x28
rproc_stop+0x48/0xd8
rproc_shutdown+0x60/0xe8
state_store+0xbc/0xf8
dev_attr_store+0x18/0x28
sysfs_kf_write+0x3c/0x50
kernfs_fop_write+0x118/0x1e0
__vfs_write+0x18/0x110
vfs_write+0xa4/0x1a8
ksys_write+0x48/0xb0
sys_write+0xc/0x18
el0_svc_naked+0x30/0x34
Code: d2800022 8b400c21 f9800031 9ac32043 (c85f7c22)
---[ end trace 32020935775616a2 ]---
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
---
drivers/of/platform.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index c00d81dfac0b..78c32b93c0e7 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -544,8 +544,6 @@ int of_platform_device_destroy(struct device *dev, void *data)
amba_device_unregister(to_amba_device(dev));
#endif
- of_node_clear_flag(dev->of_node, OF_POPULATED);
- of_node_clear_flag(dev->of_node, OF_POPULATED_BUS);
return 0;
}
EXPORT_SYMBOL_GPL(of_platform_device_destroy);
--
2.16.2
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] of: platform: stop accessing invalid dev in of_platform_device_destroy
2018-06-01 22:58 ` Srinivas Kandagatla
@ 2018-06-01 23:35 ` Srinivas Kandagatla
-1 siblings, 0 replies; 4+ messages in thread
From: Srinivas Kandagatla @ 2018-06-01 23:35 UTC (permalink / raw)
To: robh+dt, frowand.list
Cc: linux-arm-msm, bgoswami, devicetree, linux-kernel,
linux-arm-kernel, rohkumar
On 01/06/18 23:58, Srinivas Kandagatla wrote:
>
> - of_node_clear_flag(dev->of_node, OF_POPULATED);
> - of_node_clear_flag(dev->of_node, OF_POPULATED_BUS);
This change seems to have a side effect during re-probing. I will dig in
bit more to see how best it can be fixed.
thanks,
srini
^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH] of: platform: stop accessing invalid dev in of_platform_device_destroy
@ 2018-06-01 23:35 ` Srinivas Kandagatla
0 siblings, 0 replies; 4+ messages in thread
From: Srinivas Kandagatla @ 2018-06-01 23:35 UTC (permalink / raw)
To: linux-arm-kernel
On 01/06/18 23:58, Srinivas Kandagatla wrote:
>
> - of_node_clear_flag(dev->of_node, OF_POPULATED);
> - of_node_clear_flag(dev->of_node, OF_POPULATED_BUS);
This change seems to have a side effect during re-probing. I will dig in
bit more to see how best it can be fixed.
thanks,
srini
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2018-06-01 23:35 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2018-06-01 22:58 [PATCH] of: platform: stop accessing invalid dev in of_platform_device_destroy Srinivas Kandagatla
2018-06-01 22:58 ` Srinivas Kandagatla
2018-06-01 23:35 ` Srinivas Kandagatla
2018-06-01 23:35 ` Srinivas Kandagatla
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