crypto: nx - fix context leak in nx842_crypto_free_ctx

commit 344e6a4f7ff4756b9b3f75e0eb7eaec297e35540 upstream.

Since the scomp conversion, nx842_crypto_alloc_ctx() allocates the
context separately, but nx842_crypto_free_ctx() never releases it. Add
the missing kfree(ctx) to nx842_crypto_free_ctx(), and reuse
nx842_crypto_free_ctx() in the allocation error path.

Fixes: 980b570 ("crypto: nx - Migrate to scomp API")
Cc: stable@vger.kernel.org
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit b94588f5a69718be2c942f4a851125f655e4e819)
Signed-off-by: Wentao Guan <guanwentao@uniontech.com>

Author: toblux

drivers/crypto/nx/nx-842.c

@@ -115,10 +115,7 @@ void *nx842_crypto_alloc_ctx(struct nx842_driver *driver)
 	ctx->sbounce = (u8 *)__get_free_pages(GFP_KERNEL, BOUNCE_BUFFER_ORDER);
 	ctx->dbounce = (u8 *)__get_free_pages(GFP_KERNEL, BOUNCE_BUFFER_ORDER);
 	if (!ctx->wmem || !ctx->sbounce || !ctx->dbounce) {
-		kfree(ctx->wmem);
-		free_pages((unsigned long)ctx->sbounce, BOUNCE_BUFFER_ORDER);
-		free_pages((unsigned long)ctx->dbounce, BOUNCE_BUFFER_ORDER);
-		kfree(ctx);
+		nx842_crypto_free_ctx(ctx);
 		return ERR_PTR(-ENOMEM);
 	}
 
@@ -133,6 +130,7 @@ void nx842_crypto_free_ctx(void *p)
 	kfree(ctx->wmem);
 	free_pages((unsigned long)ctx->sbounce, BOUNCE_BUFFER_ORDER);
 	free_pages((unsigned long)ctx->dbounce, BOUNCE_BUFFER_ORDER);
+	kfree(ctx);
 }
 EXPORT_SYMBOL_GPL(nx842_crypto_free_ctx);