EVP shake_ctrl(): add missing NULL evp_ctx check

Reviewed-by: Viktor Dukhovni <viktor@openssl.org> Reviewed-by: Tomas Mraz <tomas@openssl.org> (Merged from #22390)
openssl · Oct 17, 2023 · 410c80d · 410c80d
1 parent 72a99ef
commit 410c80d
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/crypto/evp/legacy_sha.c b/crypto/evp/legacy_sha.c
@@ -71,7 +71,11 @@ static int sha1_int_ctrl(EVP_MD_CTX *ctx, int cmd, int p1, void *p2)
 
 static int shake_ctrl(EVP_MD_CTX *evp_ctx, int cmd, int p1, void *p2)
 {
-    KECCAK1600_CTX *ctx = evp_ctx->md_data;
+    KECCAK1600_CTX *ctx;
+
+    if (evp_ctx == NULL)
+        return 0;
+    ctx = evp_ctx->md_data;
 
     switch (cmd) {
     case EVP_MD_CTRL_XOF_LEN: