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authorDavid S. Miller <davem@davemloft.net>2015-06-08 20:06:56 -0700
committerDavid S. Miller <davem@davemloft.net>2015-06-08 20:06:56 -0700
commit941742f49762ba4c908510f036b09a46c1b14513 (patch)
treeaafb7a72c2072f98889406668003234bed56df02 /lib
parentac7ba51c215db5739eb640f2f26025ced8668285 (diff)
parent5879ae5fd052a63d5ac0684320cb7df3e83da7de (diff)
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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Diffstat (limited to 'lib')
-rw-r--r--lib/rhashtable.c1
-rw-r--r--lib/strnlen_user.c12
-rw-r--r--lib/swiotlb.c5
3 files changed, 14 insertions, 4 deletions
diff --git a/lib/rhashtable.c b/lib/rhashtable.c
index ca66a0e32c8e..a60a6d335a91 100644
--- a/lib/rhashtable.c
+++ b/lib/rhashtable.c
@@ -26,6 +26,7 @@
#include <linux/random.h>
#include <linux/rhashtable.h>
#include <linux/err.h>
+#include <linux/export.h>
#define HASH_DEFAULT_SIZE 64UL
#define HASH_MIN_SIZE 4U
diff --git a/lib/strnlen_user.c b/lib/strnlen_user.c
index a28df5206d95..fe9a32591c24 100644
--- a/lib/strnlen_user.c
+++ b/lib/strnlen_user.c
@@ -57,7 +57,8 @@ static inline long do_strnlen_user(const char __user *src, unsigned long count,
return res + find_zero(data) + 1 - align;
}
res += sizeof(unsigned long);
- if (unlikely(max < sizeof(unsigned long)))
+ /* We already handled 'unsigned long' bytes. Did we do it all ? */
+ if (unlikely(max <= sizeof(unsigned long)))
break;
max -= sizeof(unsigned long);
if (unlikely(__get_user(c,(unsigned long __user *)(src+res))))
@@ -89,8 +90,15 @@ static inline long do_strnlen_user(const char __user *src, unsigned long count,
* Get the size of a NUL-terminated string in user space.
*
* Returns the size of the string INCLUDING the terminating NUL.
- * If the string is too long, returns 'count+1'.
+ * If the string is too long, returns a number larger than @count. User
+ * has to check the return value against "> count".
* On exception (or invalid count), returns 0.
+ *
+ * NOTE! You should basically never use this function. There is
+ * almost never any valid case for using the length of a user space
+ * string, since the string can be changed at any time by other
+ * threads. Use "strncpy_from_user()" instead to get a stable copy
+ * of the string.
*/
long strnlen_user(const char __user *str, long count)
{
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 4abda074ea45..3c365ab6cf5f 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -537,8 +537,9 @@ EXPORT_SYMBOL_GPL(swiotlb_tbl_map_single);
* Allocates bounce buffer and returns its kernel virtual address.
*/
-phys_addr_t map_single(struct device *hwdev, phys_addr_t phys, size_t size,
- enum dma_data_direction dir)
+static phys_addr_t
+map_single(struct device *hwdev, phys_addr_t phys, size_t size,
+ enum dma_data_direction dir)
{
dma_addr_t start_dma_addr = phys_to_dma(hwdev, io_tlb_start);