bootspec: fix null-dereference-read

Fixes [oss-fuzz#53578](https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=53578). Fixes #25450. (cherry picked from commit 46dc071) Resolves: RHEL-36284
redhat-plumbers · May 15, 2024 · 41d2e7f · 41d2e7f
1 parent 365a74e
commit 41d2e7f
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diff --git a/src/shared/bootspec.c b/src/shared/bootspec.c
@@ -996,6 +996,8 @@ static int boot_config_find(const BootConfig *config, const char *id) {
         if (id[0] == '@') {
                 if (!strcaseeq(id, "@saved"))
                         return -1;
+                if (!config->entry_selected)
+                        return -1;
                 id = config->entry_selected;
         }
 

diff --git a/test/fuzz/fuzz-bootspec/clusterfuzz-testcase-minimized-fuzz-bootspec-5731869371269120 b/test/fuzz/fuzz-bootspec/clusterfuzz-testcase-minimized-fuzz-bootspec-5731869371269120
@@ -0,0 +1 @@
+{"config":"default @saved","loader":[""]}