| Message ID | 20240820084528.2396537-1-wintera@linux.ibm.com (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | [net,v2] s390/iucv: Fix vargs handling in iucv_alloc_device() | expand |
On 8/20/24 10:45, Alexandra Winter wrote: > iucv_alloc_device() gets a format string and a varying number of > arguments. This is incorrectly forwarded by calling dev_set_name() with > the format string and a va_list, while dev_set_name() expects also a > varying number of arguments. > > Symptoms: > Corrupted iucv device names, which can result in log messages like: > sysfs: cannot create duplicate filename '/devices/iucv/hvc_iucv1827699952' > > Fixes: 4452e8ef8c36 ("s390/iucv: Provide iucv_alloc_device() / iucv_release_device()") > Link: https://bugzilla.suse.com/show_bug.cgi?id=1228425 > Signed-off-by: Alexandra Winter <wintera@linux.ibm.com> > Reviewed-by: Thorsten Winkler <twinkler@linux.ibm.com> > --- > Discussion of v1: > Link: https://lore.kernel.org/all/2024081326-shifter-output-cb8f@gregkh/T/#mf8ae979de8acdc01f7ede0b94af6f2e110eea209 side note: that's nice that you have continued Vasily's series as your own v2 > Reported-by: kernel test robot <lkp@intel.com> > Closes: https://lore.kernel.org/oe-kbuild-all/202408091131.ATGn6YSh-lkp@intel.com/ > Vasily Gorbik asked me to send this version via the netdev mailing list. > --- > net/iucv/iucv.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/net/iucv/iucv.c b/net/iucv/iucv.c > index 1e42e13ad24e..2e615641a4e5 100644 > --- a/net/iucv/iucv.c > +++ b/net/iucv/iucv.c > @@ -86,13 +86,15 @@ struct device *iucv_alloc_device(const struct attribute_group **attrs, > { > struct device *dev; > va_list vargs; > + char buf[20]; > int rc; > > dev = kzalloc(sizeof(*dev), GFP_KERNEL); > if (!dev) > goto out_error; > va_start(vargs, fmt); > - rc = dev_set_name(dev, fmt, vargs); > + vsnprintf(buf, sizeof(buf), fmt, vargs); > + rc = dev_set_name(dev, buf); would be good to pass "%s" as fmt to dev_set_name() otherwise this patch is good for me, so please add my: Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com> > va_end(vargs); > if (rc) > goto out_error;
On Tue, 20 Aug 2024 13:51:06 +0200 Przemek Kitszel wrote: > > + rc = dev_set_name(dev, buf); > > would be good to pass "%s" as fmt to dev_set_name() Sounds like a good idea
On Tue, Aug 20, 2024 at 10:45:28AM +0200, Alexandra Winter wrote: > iucv_alloc_device() gets a format string and a varying number of > arguments. This is incorrectly forwarded by calling dev_set_name() with > the format string and a va_list, while dev_set_name() expects also a > varying number of arguments. > > Symptoms: > Corrupted iucv device names, which can result in log messages like: > sysfs: cannot create duplicate filename '/devices/iucv/hvc_iucv1827699952' > > Fixes: 4452e8ef8c36 ("s390/iucv: Provide iucv_alloc_device() / iucv_release_device()") > Link: https://bugzilla.suse.com/show_bug.cgi?id=1228425 > Signed-off-by: Alexandra Winter <wintera@linux.ibm.com> > Reviewed-by: Thorsten Winkler <twinkler@linux.ibm.com> > --- Hi, This is the friendly patch-bot of Greg Kroah-Hartman. You have sent him a patch that has triggered this response. He used to manually respond to these common problems, but in order to save his sanity (he kept writing the same thing over and over, yet to different people), I was created. Hopefully you will not take offence and will fix the problem in your patch and resubmit it so that it can be accepted into the Linux kernel tree. You are receiving this message because of the following common error(s) as indicated below: - You have marked a patch with a "Fixes:" tag for a commit that is in an older released kernel, yet you do not have a cc: stable line in the signed-off-by area at all, which means that the patch will not be applied to any older kernel releases. To properly fix this, please follow the documented rules in the Documentation/process/stable-kernel-rules.rst file for how to resolve this. If you wish to discuss this problem further, or you have questions about how to resolve this issue, please feel free to respond to this email and Greg will reply once he has dug out from the pending patches received from other developers. thanks, greg k-h's patch email bot
diff --git a/net/iucv/iucv.c b/net/iucv/iucv.c index 1e42e13ad24e..2e615641a4e5 100644 --- a/net/iucv/iucv.c +++ b/net/iucv/iucv.c @@ -86,13 +86,15 @@ struct device *iucv_alloc_device(const struct attribute_group **attrs, { struct device *dev; va_list vargs; + char buf[20]; int rc; dev = kzalloc(sizeof(*dev), GFP_KERNEL); if (!dev) goto out_error; va_start(vargs, fmt); - rc = dev_set_name(dev, fmt, vargs); + vsnprintf(buf, sizeof(buf), fmt, vargs); + rc = dev_set_name(dev, buf); va_end(vargs); if (rc) goto out_error;
iucv_alloc_device() gets a format string and a varying number of arguments. This is incorrectly forwarded by calling dev_set_name() with the format string and a va_list, while dev_set_name() expects also a varying number of arguments. Symptoms: Corrupted iucv device names, which can result in log messages like: sysfs: cannot create duplicate filename '/devices/iucv/hvc_iucv1827699952' Fixes: 4452e8ef8c36 ("s390/iucv: Provide iucv_alloc_device() / iucv_release_device()") Link: https://bugzilla.suse.com/show_bug.cgi?id=1228425 Signed-off-by: Alexandra Winter <wintera@linux.ibm.com> Reviewed-by: Thorsten Winkler <twinkler@linux.ibm.com> --- Discussion of v1: Link: https://lore.kernel.org/all/2024081326-shifter-output-cb8f@gregkh/T/#mf8ae979de8acdc01f7ede0b94af6f2e110eea209 Reported-by: kernel test robot <lkp@intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202408091131.ATGn6YSh-lkp@intel.com/ Vasily Gorbik asked me to send this version via the netdev mailing list. --- net/iucv/iucv.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)