new file mode 100644
@@ -0,0 +1,5 @@
+# The default hostaname value mismatch
+CONFIG_MMU=y
+CONFIG_EXT4_FS=m
+CONFIG_PGTABLE_LEVELS=4
+CONFIG_DEFAULT_HOSTNAME=m
@@ -392,6 +392,7 @@ static inline unsigned int populate_vars(struct tst_expr *exprs[],
strncpy(vars[cnt].id, j->tok, vars[cnt].id_len);
vars[cnt].id[vars[cnt].id_len] = 0;
vars[cnt].choice = 0;
+ vars[cnt].val = NULL;
var = find_var(vars, cnt, vars[cnt].id);
@@ -435,6 +436,9 @@ static int map(struct tst_expr_tok *expr)
if (choice != 'v')
return var->choice == choice;
+ if (var->choice != 'v')
+ return 0;
+
if (strlen(var->val) != len)
return 0;
If we add CONFIG_FOO=value to the test .needs_kconfig while the kernel config will not define the particular value we will blindly call strlen() on the val->val and end up with SegFault. Fix this by checking that the variable has value set first. Also initialize the val->val to NULL so that we get segfaults 100% of the time when we attempt to dereference the value when not defined. + Test Signed-off-by: Cyril Hrubis <chrubis@suse.cz> --- lib/newlib_tests/config07 | 5 +++++ lib/tst_kconfig.c | 4 ++++ 2 files changed, 9 insertions(+) create mode 100644 lib/newlib_tests/config07