| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Mon, 27 Jul 2015 13:39:47 +0300
From: Roger Quadros <rogerq@...com>
To: <cw00.choi@...sung.com>
CC: <ivan.ivanov@...aro.org>, <linux-omap@...r.kernel.org>,
<linux-usb@...r.kernel.org>,
linux-kernel <linux-kernel@...r.kernel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v2 1/2] extcon: fix hang and extcon_get/set_cable_state().
Chanwoo,
On 10/07/15 18:54, Chanwoo Choi wrote:
> Hi Roger,
>
> Thanks for your working.
>
> I'll review, test and apply it on next week because I'm on vacation now.
Can you please take this for -rc cycle? Thanks.
cheers,
-roger
>
> Thanks,
> Chanwoo Choi
>
> On Tue, Jul 7, 2015 at 3:06 PM, Roger Quadros <rogerq@...com> wrote:
>> Users of find_cable_index_by_name() will cause a kernel hang
>> as the while loop counter is never incremented and end condition
>> is never reached.
>>
>> extcon_get_cable_state() and extcon_set_cable_state() are broken
>> because they use cable index instead of cable id. This causes
>> the first cable state (cable.0) to be always invalid in sysfs
>> or extcon_get_cable_state() users.
>>
>> Introduce a new function find_cable_id_by_name() that fixes
>> both of the above issues.
>>
>> Fixes: commit 73b6ecdb93e8 ("extcon: Redefine the unique id of supported external connectors without 'enum extcon' type")
>> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>> Signed-off-by: Roger Quadros <rogerq@...com>
>> ---
>> drivers/extcon/extcon.c | 38 +++++++++++++++++++++++++++++---------
>> 1 file changed, 29 insertions(+), 9 deletions(-)
>>
>> diff --git a/drivers/extcon/extcon.c b/drivers/extcon/extcon.c
>> index 76157ab..987dd3c 100644
>> --- a/drivers/extcon/extcon.c
>> +++ b/drivers/extcon/extcon.c
>> @@ -124,22 +124,34 @@ static int find_cable_index_by_id(struct extcon_dev *edev, const unsigned int id
>> return -EINVAL;
>> }
>>
>> -static int find_cable_index_by_name(struct extcon_dev *edev, const char *name)
>> +static int find_cable_id_by_name(struct extcon_dev *edev, const char *name)
>> {
>> - unsigned int id = EXTCON_NONE;
>> + unsigned int id = -EINVAL;
>> int i = 0;
>>
>> - if (edev->max_supported == 0)
>> - return -EINVAL;
>> -
>> - /* Find the the number of extcon cable */
>> + /* Find the id of extcon cable */
>> while (extcon_name[i]) {
>> if (!strncmp(extcon_name[i], name, CABLE_NAME_MAX)) {
>> id = i;
>> break;
>> }
>> +
>> + i++;
>> }
>>
>> + return id;
>> +};
>> +
>> +static int find_cable_index_by_name(struct extcon_dev *edev, const char *name)
>> +{
>> + unsigned int id = EXTCON_NONE;
>> +
>> + if (edev->max_supported == 0)
>> + return -EINVAL;
>> +
>> + /* Find the the number of extcon cable */
>> + id = find_cable_id_by_name(edev, name);
>> +
>> if (id == EXTCON_NONE)
>> return -EINVAL;
>>
>> @@ -228,9 +240,11 @@ static ssize_t cable_state_show(struct device *dev,
>> struct extcon_cable *cable = container_of(attr, struct extcon_cable,
>> attr_state);
>>
>> + int i = cable->cable_index;
>> +
>> return sprintf(buf, "%d\n",
>> extcon_get_cable_state_(cable->edev,
>> - cable->cable_index));
>> + cable->edev->supported_cable[i]));
>> }
>>
>> /**
>> @@ -341,6 +355,9 @@ int extcon_get_cable_state_(struct extcon_dev *edev, const unsigned int id)
>> {
>> int index;
>>
>> + if (id == EXTCON_NONE)
>> + return -EINVAL;
>> +
>> index = find_cable_index_by_id(edev, id);
>> if (index < 0)
>> return index;
>> @@ -361,7 +378,7 @@ EXPORT_SYMBOL_GPL(extcon_get_cable_state_);
>> */
>> int extcon_get_cable_state(struct extcon_dev *edev, const char *cable_name)
>> {
>> - return extcon_get_cable_state_(edev, find_cable_index_by_name
>> + return extcon_get_cable_state_(edev, find_cable_id_by_name
>> (edev, cable_name));
>> }
>> EXPORT_SYMBOL_GPL(extcon_get_cable_state);
>> @@ -380,6 +397,9 @@ int extcon_set_cable_state_(struct extcon_dev *edev, unsigned int id,
>> u32 state;
>> int index;
>>
>> + if (id == EXTCON_NONE)
>> + return -EINVAL;
>> +
>> index = find_cable_index_by_id(edev, id);
>> if (index < 0)
>> return index;
>> @@ -404,7 +424,7 @@ EXPORT_SYMBOL_GPL(extcon_set_cable_state_);
>> int extcon_set_cable_state(struct extcon_dev *edev,
>> const char *cable_name, bool cable_state)
>> {
>> - return extcon_set_cable_state_(edev, find_cable_index_by_name
>> + return extcon_set_cable_state_(edev, find_cable_id_by_name
>> (edev, cable_name), cable_state);
>> }
>> EXPORT_SYMBOL_GPL(extcon_set_cable_state);
>> --
>> 2.1.4
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
>> the body of a message to majordomo@...r.kernel.org
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>> Please read the FAQ at http://www.tux.org/lkml/
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists