The patch titled
Subject: err.h: IS_ERR() can accept __user pointers
has been added to the -mm tree. Its filename is
errh-is_err-can-accept-__user-pointers.patch
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------------------------------------------------------
From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Subject: err.h: IS_ERR() can accept __user pointers
Sparse generates a false positive when you pass a __user or __iomem
pointer to the IS_ERR() functions.
drivers/rtc/rtc-ds1286.c:344:36: sparse: incorrect type in argument 1 (different address spaces)
drivers/rtc/rtc-ds1286.c:344:36: expected void const *ptr
drivers/rtc/rtc-ds1286.c:344:36: got unsigned int [noderef] [usertype] <asn:2>*rtcregs
We can silence these by adding a __force here and upgrading to the
latest git release of Sparse.
This change has no effect when using current Sparse releases.
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Acked-by: Christopher Li <sparse@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/err.h | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff -puN include/linux/err.h~errh-is_err-can-accept-__user-pointers include/linux/err.h
--- a/include/linux/err.h~errh-is_err-can-accept-__user-pointers
+++ a/include/linux/err.h
@@ -24,17 +24,17 @@ static inline void * __must_check ERR_PT
return (void *) error;
}
-static inline long __must_check PTR_ERR(const void *ptr)
+static inline long __must_check PTR_ERR(__force const void *ptr)
{
return (long) ptr;
}
-static inline long __must_check IS_ERR(const void *ptr)
+static inline long __must_check IS_ERR(__force const void *ptr)
{
return IS_ERR_VALUE((unsigned long)ptr);
}
-static inline long __must_check IS_ERR_OR_NULL(const void *ptr)
+static inline long __must_check IS_ERR_OR_NULL(__force const void *ptr)
{
return !ptr || IS_ERR_VALUE((unsigned long)ptr);
}
@@ -46,13 +46,13 @@ static inline long __must_check IS_ERR_O
* Explicitly cast an error-valued pointer to another pointer type in such a
* way as to make it clear that's what's going on.
*/
-static inline void * __must_check ERR_CAST(const void *ptr)
+static inline void * __must_check ERR_CAST(__force const void *ptr)
{
/* cast away the const */
return (void *) ptr;
}
-static inline int __must_check PTR_RET(const void *ptr)
+static inline int __must_check PTR_RET(__force const void *ptr)
{
if (IS_ERR(ptr))
return PTR_ERR(ptr);
_
Patches currently in -mm which might be from dan.carpenter@xxxxxxxxxx are
origin.patch
linux-next.patch
configfs-use-capped-length-for-store_attribute.patch
errh-is_err-can-accept-__user-pointers.patch
mwave-fix-info-leak-in-mwave_ioctl.patch
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