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-rw-r--r--crypto/cipher.c27
1 files changed, 13 insertions, 14 deletions
diff --git a/crypto/cipher.c b/crypto/cipher.c
index d8ca0ec8d0be..326461780673 100644
--- a/crypto/cipher.c
+++ b/crypto/cipher.c
@@ -45,15 +45,10 @@ static unsigned int crypt_slow(const struct cipher_desc *desc,
u8 buffer[bsize * 2 + alignmask];
u8 *src = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
u8 *dst = src + bsize;
- unsigned int n;
-
- n = scatterwalk_copychunks(src, in, bsize, 0);
- scatterwalk_advance(in, n);
+ scatterwalk_copychunks(src, in, bsize, 0);
desc->prfn(desc, dst, src, bsize);
-
- n = scatterwalk_copychunks(dst, out, bsize, 1);
- scatterwalk_advance(out, n);
+ scatterwalk_copychunks(dst, out, bsize, 1);
return bsize;
}
@@ -64,12 +59,16 @@ static inline unsigned int crypt_fast(const struct cipher_desc *desc,
unsigned int nbytes, u8 *tmp)
{
u8 *src, *dst;
+ u8 *real_src, *real_dst;
+
+ real_src = scatterwalk_map(in, 0);
+ real_dst = scatterwalk_map(out, 1);
- src = in->data;
- dst = scatterwalk_samebuf(in, out) ? src : out->data;
+ src = real_src;
+ dst = scatterwalk_samebuf(in, out) ? src : real_dst;
if (tmp) {
- memcpy(tmp, in->data, nbytes);
+ memcpy(tmp, src, nbytes);
src = tmp;
dst = tmp;
}
@@ -77,7 +76,10 @@ static inline unsigned int crypt_fast(const struct cipher_desc *desc,
nbytes = desc->prfn(desc, dst, src, nbytes);
if (tmp)
- memcpy(out->data, tmp, nbytes);
+ memcpy(real_dst, tmp, nbytes);
+
+ scatterwalk_unmap(real_src, 0);
+ scatterwalk_unmap(real_dst, 1);
scatterwalk_advance(in, nbytes);
scatterwalk_advance(out, nbytes);
@@ -126,9 +128,6 @@ static int crypt(const struct cipher_desc *desc,
tmp = (u8 *)buffer;
}
- scatterwalk_map(&walk_in, 0);
- scatterwalk_map(&walk_out, 1);
-
n = scatterwalk_clamp(&walk_in, n);
n = scatterwalk_clamp(&walk_out, n);