Don't free aliased pointers in ctx cmp_ctx tests

Coverity recorded issues 1551739 and 1551737, a potential double free in the
tests.  It occurs when the DUP operation fails in such a way val3_read is
returned as the same pointer as val2_read.  Ideally it should never
happen, but resetting val3_read to 0 should satisfy coverity that there
is no issue here

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Todd Short <todd.short@me.com>
(Merged from https://github.com/openssl/openssl/pull/22800)

(cherry picked from commit c8ca810da9c47d8cb6988fd14e1cb4e20b0877e8)

diff --git a/test/cmp_ctx_test.c b/test/cmp_ctx_test.c
index 71fa679ff40579a012e807c4d17d91ab0086d4fa..4a10653fc87fef80af4b4f7207999588bbb76751 100644 (file)
--- a/test/cmp_ctx_test.c
+++ b/test/cmp_ctx_test.c
@@ -391,6 +391,7 @@ execute_CTX_##SETN##_##GETN##_##FIELD(OSSL_CMP_CTX_TEST_FIXTURE *fixture) \
     } else { \
         if (DUP && val1_read == val1) { \
             TEST_error("first set did not dup the value"); \
+            val1_read = 0; \
             res = 0; \
         } \
         if (DEFAULT(val1_read)) { \
@@ -419,6 +420,7 @@ execute_CTX_##SETN##_##GETN##_##FIELD(OSSL_CMP_CTX_TEST_FIXTURE *fixture) \
     } else { \
         if (DUP && val2_read == val2) { \
             TEST_error("second set did not dup the value"); \
+            val2_read = 0; \
             res = 0; \
         } \
         if (val2 == val1) { \
@@ -448,6 +450,7 @@ execute_CTX_##SETN##_##GETN##_##FIELD(OSSL_CMP_CTX_TEST_FIXTURE *fixture) \
     } else { \
         if (DUP && val3_read == val2_read) { \
             TEST_error("third get did not create a new dup"); \
+            val3_read = 0; \
             res = 0; \
         } \
     } \