[PATCH] lib: ecdsa: fix prevent memory leak in ecdsa_add_verify_data

[Anton Moryakov]

- Ensure `free_ctx` is called in both error and success paths.
- Fix memory leak in `ctx.signature` when `do_add` fails."

Triggers found by static analyzer Svace.

Signed-off-by: Anton Moryakov <ant.v.morya...@gmail.com>
---
 lib/ecdsa/ecdsa-libcrypto.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/ecdsa/ecdsa-libcrypto.c b/lib/ecdsa/ecdsa-libcrypto.c
index 1c5dde6069..f0095e9dbc 100644
--- a/lib/ecdsa/ecdsa-libcrypto.c
+++ b/lib/ecdsa/ecdsa-libcrypto.c
@@ -363,8 +363,10 @@ int ecdsa_add_verify_data(struct image_sign_info *info, 
void *fdt)
        ret = prepare_ctx(&ctx, info);
        if (ret >= 0) {
                ret = do_add(&ctx, fdt, fdt_key_name, info);
-               if (ret < 0)
-                       ret = ret == -FDT_ERR_NOSPACE ? -ENOSPC : -EIO;
+               if (ret < 0) {
+                       free_ctx(&ctx);
+                       return ret == -FDT_ERR_NOSPACE ? -ENOSPC : -EIO;
+               }
        }
 
        free_ctx(&ctx);
-- 
2.30.2