crypto: omap-sham - Map SG pages if they are HIGHMEM before accessing

HIGHMEM pages may not be mapped so we must kmap them before accessing.
This resolves a random OOPs error that was showing up during OpenSSL SHA tests.

Signed-off-by: Joel Fernandes <joelf@ti.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/crypto/omap-sham.c b/drivers/crypto/omap-sham.c
index 4e2067df300d..710d86386965 100644
--- a/drivers/crypto/omap-sham.c
+++ b/drivers/crypto/omap-sham.c
@@ -636,11 +636,17 @@ static size_t omap_sham_append_buffer(struct omap_sham_reqctx *ctx,
 static size_t omap_sham_append_sg(struct omap_sham_reqctx *ctx)
 {
         size_t count;
+        const u8 *vaddr;
 
         while (ctx->sg) {
+                vaddr = kmap_atomic(sg_page(ctx->sg));
+
                 count = omap_sham_append_buffer(ctx,
-                                sg_virt(ctx->sg) + ctx->offset,
+                                vaddr + ctx->offset,
                                 ctx->sg->length - ctx->offset);
+
+                kunmap_atomic((void *)vaddr);
+
                 if (!count)
                         break;
                 ctx->offset += count;