[PATCH] kselftest/cgroup: fix a signedness bug

[PATCH] kselftest/cgroup: fix a signedness bug

[Dan Carpenter]

"len" needs to be signed for the error handling to work.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

diff --git a/tools/testing/selftests/cgroup/cgroup_util.c b/tools/testing/selftests/cgroup/cgroup_util.c
index b69bdeb4b9fe..1e9e3c470561 100644
--- a/tools/testing/selftests/cgroup/cgroup_util.c
+++ b/tools/testing/selftests/cgroup/cgroup_util.c
@@ -35,7 +35,7 @@ static ssize_t read_text(const char *path, char *buf, size_t max_len)
 	return len;
 }
 
-static ssize_t write_text(const char *path, char *buf, size_t len)
+static ssize_t write_text(const char *path, char *buf, ssize_t len)
 {
 	int fd;
 
@@ -140,7 +140,7 @@ long cg_read_key_long(const char *cgroup, const char *control, const char *key)
 int cg_write(const char *cgroup, const char *control, char *buf)
 {
 	char path[PATH_MAX];
-	size_t len = strlen(buf);
+	ssize_t len = strlen(buf);
 
 	snprintf(path, sizeof(path), "%s/%s", cgroup, control);
 

Re: [PATCH] kselftest/cgroup: fix a signedness bug

[Roman Gushchin]

On Thu, Jun 07, 2018 at 11:30:02AM +0300, Dan Carpenter wrote:
> "len" needs to be signed for the error handling to work.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> 
> diff --git a/tools/testing/selftests/cgroup/cgroup_util.c b/tools/testing/selftests/cgroup/cgroup_util.c
> index b69bdeb4b9fe..1e9e3c470561 100644
> --- a/tools/testing/selftests/cgroup/cgroup_util.c
> +++ b/tools/testing/selftests/cgroup/cgroup_util.c
> @@ -35,7 +35,7 @@ static ssize_t read_text(const char *path, char *buf, size_t max_len)
>  	return len;
>  }
>  
> -static ssize_t write_text(const char *path, char *buf, size_t len)
> +static ssize_t write_text(const char *path, char *buf, ssize_t len)
>  {
>  	int fd;
>  
> @@ -140,7 +140,7 @@ long cg_read_key_long(const char *cgroup, const char *control, const char *key)
>  int cg_write(const char *cgroup, const char *control, char *buf)
>  {
>  	char path[PATH_MAX];
> -	size_t len = strlen(buf);
> +	ssize_t len = strlen(buf);
>  
>  	snprintf(path, sizeof(path), "%s/%s", cgroup, control);
>  

Looks good to me!

Thanks!

Re: [PATCH] kselftest/cgroup: fix a signedness bug

[Shuah Khan]

On 06/07/2018 06:52 AM, Roman Gushchin wrote:
> On Thu, Jun 07, 2018 at 11:30:02AM +0300, Dan Carpenter wrote:
>> "len" needs to be signed for the error handling to work.
>>
>> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
>>
>> diff --git a/tools/testing/selftests/cgroup/cgroup_util.c b/tools/testing/selftests/cgroup/cgroup_util.c
>> index b69bdeb4b9fe..1e9e3c470561 100644
>> --- a/tools/testing/selftests/cgroup/cgroup_util.c
>> +++ b/tools/testing/selftests/cgroup/cgroup_util.c
>> @@ -35,7 +35,7 @@ static ssize_t read_text(const char *path, char *buf, size_t max_len)
>>  	return len;
>>  }
>>  
>> -static ssize_t write_text(const char *path, char *buf, size_t len)
>> +static ssize_t write_text(const char *path, char *buf, ssize_t len)
>>  {
>>  	int fd;
>>  
>> @@ -140,7 +140,7 @@ long cg_read_key_long(const char *cgroup, const char *control, const char *key)
>>  int cg_write(const char *cgroup, const char *control, char *buf)
>>  {
>>  	char path[PATH_MAX];
>> -	size_t len = strlen(buf);
>> +	ssize_t len = strlen(buf);
>>  
>>  	snprintf(path, sizeof(path), "%s/%s", cgroup, control);
>>  
> 
> Looks good to me!
> 
> Thanks!
> 

Thanks. Is it now in linux-kselftest next. I will send this up next week
for second update for 4.18-rc1

-- Shuah