Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6

Pull crypto fix from Herbert Xu:
 "This fixes a bug on sparc where we may dereference freed stack memory"

* 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
  crypto: Work around deallocated stack frame reference gcc bug on sparc.

1 files changed, 4 insertions, 2 deletions

diff --git a/lib/libcrc32c.c b/lib/libcrc32c.c
index 74a54b7f2562..9f79547d1b97 100644
--- a/lib/libcrc32c.c
+++ b/lib/libcrc32c.c
@@ -43,7 +43,7 @@ static struct crypto_shash *tfm;
 u32 crc32c(u32 crc, const void *address, unsigned int length)
 {
         SHASH_DESC_ON_STACK(shash, tfm);
-        u32 *ctx = (u32 *)shash_desc_ctx(shash);
+        u32 ret, *ctx = (u32 *)shash_desc_ctx(shash);
         int err;
 
         shash->tfm = tfm;
@@ -53,7 +53,9 @@ u32 crc32c(u32 crc, const void *address, unsigned int length)
         err = crypto_shash_update(shash, address, length);
         BUG_ON(err);
 
-        return *ctx;
+        ret = *ctx;
+        barrier_data(ctx);
+        return ret;
 }
 
 EXPORT_SYMBOL(crc32c);