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openprom: fix warning 

Fix following warnings:
openprom.c:510:2: warning: 'tmp' may be used uninitialized in this function [-Wmaybe-uninitialized]
openprom.c:503:3: warning: 'str' may be used uninitialized in this function [-Wmaybe-uninitialized]
openprom.c:459:8: warning: 'str' may be used uninitialized in this function [-Wmaybe-uninitialized]
openprom.c:422:7: warning: 'str' may be used uninitialized in this function [-Wmaybe-uninitialized]

Fixed by introducing PTR_ERR etc.
This simplified the code as a nice side effect.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sam Ravnborg 2016-04-24 15:24:33 +02:00 committed by David S. Miller
parent 20c698d779
commit 21916a4a29
1 changed files with 16 additions and 24 deletions
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40
drivers/sbus/char/openprom.c
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@ -383,20 +383,12 @@ static struct device_node *get_node(phandle n, DATA *data)
}
/* Copy in a whole string from userspace into kernelspace. */
static int copyin_string(char __user *user, size_t len, char **ptr)
static char * copyin_string(char __user *user, size_t len)
{
char *tmp;
if ((ssize_t)len < 0 || (ssize_t)(len + 1) < 0)
return -EINVAL;
return ERR_PTR(-EINVAL);
tmp = memdup_user_nul(user, len);
if (IS_ERR(tmp))
return PTR_ERR(tmp);
*ptr = tmp;
return 0;
return memdup_user_nul(user, len);
}
/*
@ -415,9 +407,9 @@ static int opiocget(void __user *argp, DATA *data)
dp = get_node(op.op_nodeid, data);
err = copyin_string(op.op_name, op.op_namelen, &str);
if (err)
return err;
str = copyin_string(op.op_name, op.op_namelen);
if (IS_ERR(str))
return PTR_ERR(str);
pval = of_get_property(dp, str, &len);
err = 0;
@ -440,7 +432,7 @@ static int opiocnextprop(void __user *argp, DATA *data)
struct device_node *dp;
struct property *prop;
char *str;
int err, len;
int len;
if (copy_from_user(&op, argp, sizeof(op)))
return -EFAULT;
@ -449,9 +441,9 @@ static int opiocnextprop(void __user *argp, DATA *data)
if (!dp)
return -EINVAL;
err = copyin_string(op.op_name, op.op_namelen, &str);
if (err)
return err;
str = copyin_string(op.op_name, op.op_namelen);
if (IS_ERR(str))
return PTR_ERR(str);
if (str[0] == '\0') {
prop = dp->properties;
@ -494,14 +486,14 @@ static int opiocset(void __user *argp, DATA *data)
if (!dp)
return -EINVAL;
err = copyin_string(op.op_name, op.op_namelen, &str);
if (err)
return err;
str = copyin_string(op.op_name, op.op_namelen);
if (IS_ERR(str))
return PTR_ERR(str);
err = copyin_string(op.op_buf, op.op_buflen, &tmp);
if (err) {
tmp = copyin_string(op.op_buf, op.op_buflen);
if (IS_ERR(tmp)) {
kfree(str);
return err;
return PTR_ERR(tmp);
}
err = of_set_property(dp, str, tmp, op.op_buflen);