File unbound-1.20-CVE-2024-43167.patch of Package unbound.35305

commit fe4c67b2287ebf916198b98e8e69db8815e57464
Author: zhailiangliang <zhailiangliang@loongson.cn>
Date:   Tue May 21 08:40:16 2024 +0000

    [1.20] [CVE-2024-43167]
    
    fix null pointer dereference issue in function ub_ctx_set_fwd of file libunbound/libunbound.c

diff --git a/libunbound/libunbound.c b/libunbound/libunbound.c
index 17057ec6..3c895514 100644
--- a/libunbound/libunbound.c
+++ b/libunbound/libunbound.c
@@ -981,7 +981,8 @@ ub_ctx_set_fwd(struct ub_ctx* ctx, const char* addr)
 	if(!addr) {
 		/* disable fwd mode - the root stub should be first. */
 		if(ctx->env->cfg->forwards &&
-			strcmp(ctx->env->cfg->forwards->name, ".") == 0) {
+			(ctx->env->cfg->forwards->name &&
+			strcmp(ctx->env->cfg->forwards->name, ".") == 0)) {
 			s = ctx->env->cfg->forwards;
 			ctx->env->cfg->forwards = s->next;
 			s->next = NULL;
@@ -1001,7 +1002,8 @@ ub_ctx_set_fwd(struct ub_ctx* ctx, const char* addr)
 	/* it parses, add root stub in front of list */
 	lock_basic_lock(&ctx->cfglock);
 	if(!ctx->env->cfg->forwards ||
-		strcmp(ctx->env->cfg->forwards->name, ".") != 0) {
+		(ctx->env->cfg->forwards->name &&
+		strcmp(ctx->env->cfg->forwards->name, ".") != 0)) {
 		s = calloc(1, sizeof(*s));
 		if(!s) {
 			lock_basic_unlock(&ctx->cfglock);
@@ -1019,6 +1021,7 @@ ub_ctx_set_fwd(struct ub_ctx* ctx, const char* addr)
 		ctx->env->cfg->forwards = s;
 	} else {
 		log_assert(ctx->env->cfg->forwards);
+		log_assert(ctx->env->cfg->forwards->name);
 		s = ctx->env->cfg->forwards;
 	}
 	dupl = strdup(addr);