* [PATCH v2 0/2] MIPS: fix possible memory leak while module exiting @ 2022-11-04 3:39 Yang Yingliang 2022-11-04 3:39 ` [PATCH v2 1/2] MIPS: vpe-mt: " Yang Yingliang ` (2 more replies) 0 siblings, 3 replies; 7+ messages in thread From: Yang Yingliang @ 2022-11-04 3:39 UTC (permalink / raw) To: linux-mips Cc: tsbogend, dengcheng.zhu, Steven.Hill, Qais.Yousef, blogic, yangyingliang This patchset fixes two device name leaks while module exiting in normal or error path. v1 -> v2: Add fix tag in patch #1. Yang Yingliang (2): MIPS: vpe-mt: fix possible memory leak while module exiting MIPS: vpe-cmp: fix possible memory leak while module exiting arch/mips/kernel/vpe-cmp.c | 4 ++-- arch/mips/kernel/vpe-mt.c | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-) -- 2.25.1 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [PATCH v2 1/2] MIPS: vpe-mt: fix possible memory leak while module exiting 2022-11-04 3:39 [PATCH v2 0/2] MIPS: fix possible memory leak while module exiting Yang Yingliang @ 2022-11-04 3:39 ` Yang Yingliang 2022-11-22 11:21 ` Thomas Bogendoerfer 2022-11-04 3:39 ` [PATCH v2 2/2] MIPS: vpe-cmp: " Yang Yingliang 2022-11-22 12:29 ` [PATCH v2 0/2] MIPS: " Thomas Bogendoerfer 2 siblings, 1 reply; 7+ messages in thread From: Yang Yingliang @ 2022-11-04 3:39 UTC (permalink / raw) To: linux-mips Cc: tsbogend, dengcheng.zhu, Steven.Hill, Qais.Yousef, blogic, yangyingliang Afer commit 1fa5ae857bb1 ("driver core: get rid of struct device's bus_id string array"), the name of device is allocated dynamically, it need be freed when module exiting, call put_device() to give up reference, so that it can be freed in kobject_cleanup() when the refcount hit to 0. The vpe_device is static, so remove kfree() from vpe_device_release(). Fixes: 1fa5ae857bb1 ("driver core: get rid of struct device's bus_id string array") Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> --- arch/mips/kernel/vpe-mt.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/mips/kernel/vpe-mt.c b/arch/mips/kernel/vpe-mt.c index bad6b0891b2b..84a82b551ec3 100644 --- a/arch/mips/kernel/vpe-mt.c +++ b/arch/mips/kernel/vpe-mt.c @@ -313,7 +313,6 @@ ATTRIBUTE_GROUPS(vpe); static void vpe_device_release(struct device *cd) { - kfree(cd); } static struct class vpe_class = { @@ -497,6 +496,7 @@ int __init vpe_module_init(void) device_del(&vpe_device); out_class: + put_device(&vpe_device); class_unregister(&vpe_class); out_chrdev: @@ -509,7 +509,7 @@ void __exit vpe_module_exit(void) { struct vpe *v, *n; - device_del(&vpe_device); + device_unregister(&vpe_device); class_unregister(&vpe_class); unregister_chrdev(major, VPE_MODULE_NAME); -- 2.25.1 ^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: [PATCH v2 1/2] MIPS: vpe-mt: fix possible memory leak while module exiting 2022-11-04 3:39 ` [PATCH v2 1/2] MIPS: vpe-mt: " Yang Yingliang @ 2022-11-22 11:21 ` Thomas Bogendoerfer 2022-11-22 11:41 ` Yang Yingliang 0 siblings, 1 reply; 7+ messages in thread From: Thomas Bogendoerfer @ 2022-11-22 11:21 UTC (permalink / raw) To: Yang Yingliang Cc: linux-mips, dengcheng.zhu, Steven.Hill, Qais.Yousef, blogic On Fri, Nov 04, 2022 at 11:39:44AM +0800, Yang Yingliang wrote: > Afer commit 1fa5ae857bb1 ("driver core: get rid of struct device's > bus_id string array"), the name of device is allocated dynamically, > it need be freed when module exiting, call put_device() to give up > reference, so that it can be freed in kobject_cleanup() when the > refcount hit to 0. The vpe_device is static, so remove kfree() from > vpe_device_release(). > > Fixes: 1fa5ae857bb1 ("driver core: get rid of struct device's bus_id string array") > Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> > --- > arch/mips/kernel/vpe-mt.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/arch/mips/kernel/vpe-mt.c b/arch/mips/kernel/vpe-mt.c > index bad6b0891b2b..84a82b551ec3 100644 > --- a/arch/mips/kernel/vpe-mt.c > +++ b/arch/mips/kernel/vpe-mt.c > @@ -313,7 +313,6 @@ ATTRIBUTE_GROUPS(vpe); > > static void vpe_device_release(struct device *cd) > { > - kfree(cd); > } as this is empty now, we can IMHO remove the function completly. Same for the other patch in this series. Thomas. -- Crap can work. Given enough thrust pigs will fly, but it's not necessarily a good idea. [ RFC1925, 2.3 ] ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH v2 1/2] MIPS: vpe-mt: fix possible memory leak while module exiting 2022-11-22 11:21 ` Thomas Bogendoerfer @ 2022-11-22 11:41 ` Yang Yingliang 2022-11-22 12:07 ` Thomas Bogendoerfer 0 siblings, 1 reply; 7+ messages in thread From: Yang Yingliang @ 2022-11-22 11:41 UTC (permalink / raw) To: Thomas Bogendoerfer Cc: linux-mips, dengcheng.zhu, Steven.Hill, Qais.Yousef, blogic, yangyingliang Hi, On 2022/11/22 19:21, Thomas Bogendoerfer wrote: > On Fri, Nov 04, 2022 at 11:39:44AM +0800, Yang Yingliang wrote: >> Afer commit 1fa5ae857bb1 ("driver core: get rid of struct device's >> bus_id string array"), the name of device is allocated dynamically, >> it need be freed when module exiting, call put_device() to give up >> reference, so that it can be freed in kobject_cleanup() when the >> refcount hit to 0. The vpe_device is static, so remove kfree() from >> vpe_device_release(). >> >> Fixes: 1fa5ae857bb1 ("driver core: get rid of struct device's bus_id string array") >> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> >> --- >> arch/mips/kernel/vpe-mt.c | 4 ++-- >> 1 file changed, 2 insertions(+), 2 deletions(-) >> >> diff --git a/arch/mips/kernel/vpe-mt.c b/arch/mips/kernel/vpe-mt.c >> index bad6b0891b2b..84a82b551ec3 100644 >> --- a/arch/mips/kernel/vpe-mt.c >> +++ b/arch/mips/kernel/vpe-mt.c >> @@ -313,7 +313,6 @@ ATTRIBUTE_GROUPS(vpe); >> >> static void vpe_device_release(struct device *cd) >> { >> - kfree(cd); >> } > as this is empty now, we can IMHO remove the function completly. Same > for the other patch in this series. It can not be removed, or it will cause WARNING in device_release() when calling put_device()/device_unregister(). static void device_release(struct kobject *kobj) { ... if (dev->release) dev->release(dev); else if (dev->type && dev->type->release) dev->type->release(dev); else if (dev->class && dev->class->dev_release) dev->class->dev_release(dev); else WARN(1, KERN_ERR "Device '%s' does not have a release() function, it is broken and must be fixed. See Documentation/core-api/kobject.rst.\n", dev_name(dev)); // WANING here ... } Thanks, Yang > > Thomas. > ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH v2 1/2] MIPS: vpe-mt: fix possible memory leak while module exiting 2022-11-22 11:41 ` Yang Yingliang @ 2022-11-22 12:07 ` Thomas Bogendoerfer 0 siblings, 0 replies; 7+ messages in thread From: Thomas Bogendoerfer @ 2022-11-22 12:07 UTC (permalink / raw) To: Yang Yingliang Cc: linux-mips, dengcheng.zhu, Steven.Hill, Qais.Yousef, blogic On Tue, Nov 22, 2022 at 07:41:26PM +0800, Yang Yingliang wrote: > Hi, > > On 2022/11/22 19:21, Thomas Bogendoerfer wrote: > > On Fri, Nov 04, 2022 at 11:39:44AM +0800, Yang Yingliang wrote: > > > Afer commit 1fa5ae857bb1 ("driver core: get rid of struct device's > > > bus_id string array"), the name of device is allocated dynamically, > > > it need be freed when module exiting, call put_device() to give up > > > reference, so that it can be freed in kobject_cleanup() when the > > > refcount hit to 0. The vpe_device is static, so remove kfree() from > > > vpe_device_release(). > > > > > > Fixes: 1fa5ae857bb1 ("driver core: get rid of struct device's bus_id string array") > > > Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> > > > --- > > > arch/mips/kernel/vpe-mt.c | 4 ++-- > > > 1 file changed, 2 insertions(+), 2 deletions(-) > > > > > > diff --git a/arch/mips/kernel/vpe-mt.c b/arch/mips/kernel/vpe-mt.c > > > index bad6b0891b2b..84a82b551ec3 100644 > > > --- a/arch/mips/kernel/vpe-mt.c > > > +++ b/arch/mips/kernel/vpe-mt.c > > > @@ -313,7 +313,6 @@ ATTRIBUTE_GROUPS(vpe); > > > static void vpe_device_release(struct device *cd) > > > { > > > - kfree(cd); > > > } > > as this is empty now, we can IMHO remove the function completly. Same > > for the other patch in this series. > It can not be removed, or it will cause WARNING in device_release() when > calling > put_device()/device_unregister(). > > static void device_release(struct kobject *kobj) > { > ... > > if (dev->release) > dev->release(dev); > else if (dev->type && dev->type->release) > dev->type->release(dev); > else if (dev->class && dev->class->dev_release) > dev->class->dev_release(dev); > else > WARN(1, KERN_ERR "Device '%s' does not have a release() > function, it is broken and must be fixed. See > Documentation/core-api/kobject.rst.\n", > dev_name(dev)); // WANING here you are right, thank you for looking into that, Thomas. -- Crap can work. Given enough thrust pigs will fly, but it's not necessarily a good idea. [ RFC1925, 2.3 ] ^ permalink raw reply [flat|nested] 7+ messages in thread
* [PATCH v2 2/2] MIPS: vpe-cmp: fix possible memory leak while module exiting 2022-11-04 3:39 [PATCH v2 0/2] MIPS: fix possible memory leak while module exiting Yang Yingliang 2022-11-04 3:39 ` [PATCH v2 1/2] MIPS: vpe-mt: " Yang Yingliang @ 2022-11-04 3:39 ` Yang Yingliang 2022-11-22 12:29 ` [PATCH v2 0/2] MIPS: " Thomas Bogendoerfer 2 siblings, 0 replies; 7+ messages in thread From: Yang Yingliang @ 2022-11-04 3:39 UTC (permalink / raw) To: linux-mips Cc: tsbogend, dengcheng.zhu, Steven.Hill, Qais.Yousef, blogic, yangyingliang dev_set_name() allocates memory for name, it need be freed when module exiting, call put_device() to give up reference, so that it can be freed in kobject_cleanup() when the refcount hit to 0. The vpe_device is static, so remove kfree() from vpe_device_release(). Fixes: 17a1d523aa58 ("MIPS: APRP: Add VPE loader support for CMP platforms.") Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> --- arch/mips/kernel/vpe-cmp.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/mips/kernel/vpe-cmp.c b/arch/mips/kernel/vpe-cmp.c index e673603e11e5..92140edb3ce3 100644 --- a/arch/mips/kernel/vpe-cmp.c +++ b/arch/mips/kernel/vpe-cmp.c @@ -75,7 +75,6 @@ ATTRIBUTE_GROUPS(vpe); static void vpe_device_release(struct device *cd) { - kfree(cd); } static struct class vpe_class = { @@ -157,6 +156,7 @@ int __init vpe_module_init(void) device_del(&vpe_device); out_class: + put_device(&vpe_device); class_unregister(&vpe_class); out_chrdev: @@ -169,7 +169,7 @@ void __exit vpe_module_exit(void) { struct vpe *v, *n; - device_del(&vpe_device); + device_unregister(&vpe_device); class_unregister(&vpe_class); unregister_chrdev(major, VPE_MODULE_NAME); -- 2.25.1 ^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: [PATCH v2 0/2] MIPS: fix possible memory leak while module exiting 2022-11-04 3:39 [PATCH v2 0/2] MIPS: fix possible memory leak while module exiting Yang Yingliang 2022-11-04 3:39 ` [PATCH v2 1/2] MIPS: vpe-mt: " Yang Yingliang 2022-11-04 3:39 ` [PATCH v2 2/2] MIPS: vpe-cmp: " Yang Yingliang @ 2022-11-22 12:29 ` Thomas Bogendoerfer 2 siblings, 0 replies; 7+ messages in thread From: Thomas Bogendoerfer @ 2022-11-22 12:29 UTC (permalink / raw) To: Yang Yingliang Cc: linux-mips, dengcheng.zhu, Steven.Hill, Qais.Yousef, blogic On Fri, Nov 04, 2022 at 11:39:43AM +0800, Yang Yingliang wrote: > This patchset fixes two device name leaks while module exiting > in normal or error path. > > v1 -> v2: > Add fix tag in patch #1. > > Yang Yingliang (2): > MIPS: vpe-mt: fix possible memory leak while module exiting > MIPS: vpe-cmp: fix possible memory leak while module exiting > > arch/mips/kernel/vpe-cmp.c | 4 ++-- > arch/mips/kernel/vpe-mt.c | 4 ++-- > 2 files changed, 4 insertions(+), 4 deletions(-) > > -- > 2.25.1 series applied to mips-next. Thomas. -- Crap can work. Given enough thrust pigs will fly, but it's not necessarily a good idea. [ RFC1925, 2.3 ] ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2022-11-22 12:30 UTC | newest] Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2022-11-04 3:39 [PATCH v2 0/2] MIPS: fix possible memory leak while module exiting Yang Yingliang 2022-11-04 3:39 ` [PATCH v2 1/2] MIPS: vpe-mt: " Yang Yingliang 2022-11-22 11:21 ` Thomas Bogendoerfer 2022-11-22 11:41 ` Yang Yingliang 2022-11-22 12:07 ` Thomas Bogendoerfer 2022-11-04 3:39 ` [PATCH v2 2/2] MIPS: vpe-cmp: " Yang Yingliang 2022-11-22 12:29 ` [PATCH v2 0/2] MIPS: " Thomas Bogendoerfer
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