[PATCH v1] drivers/base/auxiliary: check return value of strrchr()

[PATCH v1] drivers/base/auxiliary: check return value of strrchr()

[Li Zhong]

From: lily <floridsleeves@gmail.com>

The return value of strrchr() could be NULL, which will cause invalid
offset in (int)(p - name). So we check it here.

Signed-off-by: Li Zhong <floridsleeves@gmail.com>
---
 drivers/base/auxiliary.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/base/auxiliary.c b/drivers/base/auxiliary.c
index 8c5e65930617..7ac23be47e1f 100644
--- a/drivers/base/auxiliary.c
+++ b/drivers/base/auxiliary.c
@@ -191,7 +191,8 @@ static int auxiliary_uevent(struct device *dev, struct kobj_uevent_env *env)
 
 	name = dev_name(dev);
 	p = strrchr(name, '.');
-
+	if (!p)
+		return -EINVAL;
 	return add_uevent_var(env, "MODALIAS=%s%.*s", AUXILIARY_MODULE_PREFIX,
 			      (int)(p - name), name);
 }
-- 
2.25.1

Re: [PATCH v1] drivers/base/auxiliary: check return value of strrchr()

[Greg KH]

On Sun, Aug 28, 2022 at 01:40:40PM -0700, Li Zhong wrote:
> From: lily <floridsleeves@gmail.com>
> 
> The return value of strrchr() could be NULL, which will cause invalid
> offset in (int)(p - name). So we check it here.
> 
> Signed-off-by: Li Zhong <floridsleeves@gmail.com>
> ---
>  drivers/base/auxiliary.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/base/auxiliary.c b/drivers/base/auxiliary.c
> index 8c5e65930617..7ac23be47e1f 100644
> --- a/drivers/base/auxiliary.c
> +++ b/drivers/base/auxiliary.c
> @@ -191,7 +191,8 @@ static int auxiliary_uevent(struct device *dev, struct kobj_uevent_env *env)
>  
>  	name = dev_name(dev);
>  	p = strrchr(name, '.');
> -
> +	if (!p)
> +		return -EINVAL;
>  	return add_uevent_var(env, "MODALIAS=%s%.*s", AUXILIARY_MODULE_PREFIX,
>  			      (int)(p - name), name);
>  }
> -- 
> 2.25.1
> 

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:

- It looks like you did not use your "real" name for the patch on either
  the Signed-off-by: line, or the From: line (both of which have to
  match).  Please read the kernel file, Documentation/SubmittingPatches
  for how to do this correctly.

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

Re: [PATCH v1] drivers/base/auxiliary: check return value of strrchr()

[Greg KH]

On Fri, Sep 02, 2022 at 11:25:31PM -0700, Li Zhong wrote:
> From: Li Zhong <floridsleeves@gmail.com>
> 
> The return value of strrchr() could be NULL, which will cause invalid
> offset in (int)(p - name). So we check it here.
> 
> Signed-off-by: Li Zhong <floridsleeves@gmail.com>
> ---
>  drivers/base/auxiliary.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/base/auxiliary.c b/drivers/base/auxiliary.c
> index 8c5e65930617..7ac23be47e1f 100644
> --- a/drivers/base/auxiliary.c
> +++ b/drivers/base/auxiliary.c
> @@ -191,7 +191,8 @@ static int auxiliary_uevent(struct device *dev,
> struct kobj_uevent_env *env)
> 
>   name = dev_name(dev);
>   p = strrchr(name, '.');
> -
> + if (!p)
> + return -EINVAL;
>   return add_uevent_var(env, "MODALIAS=%s%.*s", AUXILIARY_MODULE_PREFIX,
>         (int)(p - name), name);
>  }
> -- 
> 2.25.1

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:

- Your patch is malformed (tabs converted to spaces, linewrapped, etc.)
  and can not be applied.  Please read the file,
  Documentation/email-clients.txt in order to fix 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

[PATCH v1] drivers/base/auxiliary: check return value of strrchr()

[Li Zhong]

From: Li Zhong <floridsleeves@gmail.com>

The return value of strrchr() could be NULL, which will cause invalid
offset in (int)(p - name). So we check it here.

Signed-off-by: Li Zhong <floridsleeves@gmail.com>
---
 drivers/base/auxiliary.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/base/auxiliary.c b/drivers/base/auxiliary.c
index 8c5e65930617..7ac23be47e1f 100644
--- a/drivers/base/auxiliary.c
+++ b/drivers/base/auxiliary.c
@@ -191,7 +191,8 @@ static int auxiliary_uevent(struct device *dev,
struct kobj_uevent_env *env)

  name = dev_name(dev);
  p = strrchr(name, '.');
-
+ if (!p)
+ return -EINVAL;
  return add_uevent_var(env, "MODALIAS=%s%.*s", AUXILIARY_MODULE_PREFIX,
        (int)(p - name), name);
 }
-- 
2.25.1