1 files changed, 22 insertions, 5 deletions

diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 54c248526b55..c93870987b58 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -6,6 +6,7 @@
 #include <linux/vmalloc.h>
 #include <linux/splice.h>
 #include <net/checksum.h>
+#include <linux/scatterlist.h>
 
 #define PIPE_PARANOIA /* for now */
 
@@ -135,7 +136,7 @@
 
 static int copyout(void __user *to, const void *from, size_t n)
 {
-	if (access_ok(VERIFY_WRITE, to, n)) {
+	if (access_ok(to, n)) {
 		kasan_check_read(from, n);
 		n = raw_copy_to_user(to, from, n);
 	}
@@ -144,7 +145,7 @@ static int copyout(void __user *to, const void *from, size_t n)
 
 static int copyin(void *to, const void __user *from, size_t n)
 {
-	if (access_ok(VERIFY_READ, from, n)) {
+	if (access_ok(from, n)) {
 		kasan_check_write(to, n);
 		n = raw_copy_from_user(to, from, n);
 	}
@@ -613,7 +614,7 @@ EXPORT_SYMBOL(_copy_to_iter);
 #ifdef CONFIG_ARCH_HAS_UACCESS_MCSAFE
 static int copyout_mcsafe(void __user *to, const void *from, size_t n)
 {
-	if (access_ok(VERIFY_WRITE, to, n)) {
+	if (access_ok(to, n)) {
 		kasan_check_read(from, n);
 		n = copy_to_user_mcsafe((__force void *) to, from, n);
 	}
@@ -1464,10 +1465,11 @@ bool csum_and_copy_from_iter_full(void *addr, size_t bytes, __wsum *csum,
 }
 EXPORT_SYMBOL(csum_and_copy_from_iter_full);
 
-size_t csum_and_copy_to_iter(const void *addr, size_t bytes, __wsum *csum,
+size_t csum_and_copy_to_iter(const void *addr, size_t bytes, void *csump,
 			     struct iov_iter *i)
 {
 	const char *from = addr;
+	__wsum *csum = csump;
 	__wsum sum, next;
 	size_t off = 0;
 
@@ -1510,6 +1512,21 @@ size_t csum_and_copy_to_iter(const void *addr, size_t bytes, __wsum *csum,
 }
 EXPORT_SYMBOL(csum_and_copy_to_iter);
 
+size_t hash_and_copy_to_iter(const void *addr, size_t bytes, void *hashp,
+		struct iov_iter *i)
+{
+	struct ahash_request *hash = hashp;
+	struct scatterlist sg;
+	size_t copied;
+
+	copied = copy_to_iter(addr, bytes, i);
+	sg_init_one(&sg, addr, copied);
+	ahash_request_set_crypt(hash, &sg, NULL, copied);
+	crypto_ahash_update(hash);
+	return copied;
+}
+EXPORT_SYMBOL(hash_and_copy_to_iter);
+
 int iov_iter_npages(const struct iov_iter *i, int maxpages)
 {
 	size_t size = i->count;
@@ -1646,7 +1663,7 @@ int import_single_range(int rw, void __user *buf, size_t len,
 {
 	if (len > MAX_RW_COUNT)
 		len = MAX_RW_COUNT;
-	if (unlikely(!access_ok(!rw, buf, len)))
+	if (unlikely(!access_ok(buf, len)))
 		return -EFAULT;
 
 	iov->iov_base = buf;