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s390/appldata: make copy_from_user() invocations provably correct

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Just change the type of "len" to unsigned int so the compiler can prove
that we don't have a buffer overflow (and generates less code).
We get rid of these:

In function 'copy_from_user',
    inlined from 'appldata_interval_handler' at
    arch/s390/appldata/appldata_base.c:265:
      uaccess.h:303: warning: call to 'copy_from_user_overflow' declared
      with attribute warning: copy_from_user() buffer size is not provably
      correct
In function 'copy_from_user',
    inlined from 'appldata_timer_handler' at
    arch/s390/appldata/appldata_base.c:225:
      uaccess.h:303: warning: call to 'copy_from_user_overflow' declared
      with attribute warning: copy_from_user() buffer size is not provably
      correct
In function 'copy_from_user',
    inlined from 'appldata_generic_handler' at
    arch/s390/appldata/appldata_base.c:333:
      uaccess.h:303: warning: call to 'copy_from_user_overflow' declared
      with attribute warning: copy_from_user() buffer size is not provably
      correct

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens
2013-10-14 14:08:35 +02:00
committed by Martin Schwidefsky
parent 041058a16a
commit 57f47ba0cb
1 changed files with 5 additions and 3 deletions
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arch/s390/appldata/appldata_base.c
+5 -3
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@@ -204,7 +204,7 @@ static int
appldata_timer_handler(ctl_table *ctl, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
int len;
unsigned int len;
char buf[2];
if (!*lenp || *ppos) {
@@ -246,7 +246,8 @@ static int
appldata_interval_handler(ctl_table *ctl, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
int len, interval;
unsigned int len;
int interval;
char buf[16];
if (!*lenp || *ppos) {
@@ -290,7 +291,8 @@ appldata_generic_handler(ctl_table *ctl, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
struct appldata_ops *ops = NULL, *tmp_ops;
int rc, len, found;
unsigned int len;
int rc, found;
char buf[2];
struct list_head *lh;