File dhcp-CVE-2022-2928.patch of Package dhcp

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File dhcp-CVE-2022-2928.patch of Package dhcp (Revision 8502103c5ae0a4f9daafb833000ce099)

Currently displaying revision 8502103c5ae0a4f9daafb833000ce099 , Show latest

--- common/options.c.orig
+++ common/options.c
@@ -4349,6 +4349,8 @@ add_option(struct option_state *options,
 	if (!option_cache_allocate(&oc, MDL)) {
 		log_error("No memory for option cache adding %s (option %d).",
 			  option->name, option_num);
+		/* Get rid of reference created during hash lookup. */
+		option_dereference(&option, MDL);
 		return 0;
 	}
 
@@ -4360,6 +4362,8 @@ add_option(struct option_state *options,
 			     MDL)) {
 		log_error("No memory for constant data adding %s (option %d).",
 			  option->name, option_num);
+		/* Get rid of reference created during hash lookup. */
+		option_dereference(&option, MDL);
 		option_cache_dereference(&oc, MDL);
 		return 0;
 	}
@@ -4368,6 +4372,9 @@ add_option(struct option_state *options,
 	save_option(&dhcp_universe, options, oc);
 	option_cache_dereference(&oc, MDL);
 
+	/* Get rid of reference created during hash lookup. */
+	option_dereference(&option, MDL);
+
 	return 1;
 }
 
--- common/tests/option_unittest.c.orig
+++ common/tests/option_unittest.c
@@ -130,6 +130,59 @@ ATF_TC_BODY(pretty_print_option, tc)
 }
 
 
+ATF_TC(add_option_ref_cnt);
+
+ATF_TC_HEAD(add_option_ref_cnt, tc)
+{
+    atf_tc_set_md_var(tc, "descr",
+        "Verify add_option() does not leak option ref counts.");
+}
+
+ATF_TC_BODY(add_option_ref_cnt, tc)
+{
+    struct option_state *options = NULL;
+    struct option *option = NULL;
+    unsigned int cid_code = DHO_DHCP_CLIENT_IDENTIFIER;
+    char *cid_str = "1234";
+    int refcnt_before = 0;
+
+    // Look up the option we're going to add.
+    initialize_common_option_spaces();
+    if (!option_code_hash_lookup(&option, dhcp_universe.code_hash,
+                                 &cid_code, 0, MDL)) {
+        atf_tc_fail("cannot find option definition?");
+    }
+
+    // Get the option's reference count before we call add_options.
+    refcnt_before = option->refcnt;
+
+    // Allocate a option_state to which to add an option.
+    if (!option_state_allocate(&options, MDL)) {
+	    atf_tc_fail("cannot allocat options state");
+    }
+
+    // Call add_option() to add the option to the option state.
+    if (!add_option(options, cid_code, cid_str, strlen(cid_str))) {
+	    atf_tc_fail("add_option returned 0");
+    }
+
+    // Verify that calling add_option() only adds 1 to the option ref count.
+    if (option->refcnt != (refcnt_before + 1)) {
+        atf_tc_fail("after add_option(), count is wrong, before %d, after: %d",
+                    refcnt_before, option->refcnt);
+    }
+
+    // Derefrence the option_state, this should reduce the ref count to
+    // it's starting value.
+    option_state_dereference(&options, MDL);
+
+    // Verify that dereferencing option_state restores option ref count.
+    if (option->refcnt != refcnt_before) {
+        atf_tc_fail("after state deref, count is wrong, before %d, after: %d",
+                    refcnt_before, option->refcnt);
+    }
+}
+
 /* This macro defines main() method that will call specified
    test cases. tp and simple_test_case names can be whatever you want
    as long as it is a valid variable identifier. */
@@ -138,5 +191,6 @@ ATF_TP_ADD_TCS(tp)
     ATF_TP_ADD_TC(tp, option_refcnt);
     ATF_TP_ADD_TC(tp, pretty_print_option);
+    ATF_TP_ADD_TC(tp, add_option_ref_cnt);
 
     return (atf_no_error());
 }

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File dhcp-CVE-2022-2928.patch of Package dhcp (Revision 8502103c5ae0a4f9daafb833000ce099)

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