From: Sam Ravnborg <sam@xxxxxxxxxxxx>
Date: Sun, 24 Apr 2016 15:24:33 +0200
Subject: [PATCH 1/1] 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@xxxxxxxxxxxx>
---
drivers/sbus/char/openprom.c | 40 ++++++++++++++++------------------------
1 file changed, 16 insertions(+), 24 deletions(-)
Build tested only!
Sam
diff --git a/drivers/sbus/char/openprom.c b/drivers/sbus/char/openprom.c
index e077ebd..4612691 100644
--- a/drivers/sbus/char/openprom.c
+++ b/drivers/sbus/char/openprom.c
@@ -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;
-
- tmp = memdup_user_nul(user, len);
- if (IS_ERR(tmp))
- return PTR_ERR(tmp);
+ return ERR_PTR(-EINVAL);
- *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);
--
1.8.3.1
--
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