Fixes:
opts-global.cc:75:15: runtime error: store to address 0x00000bc9be70 with
insufficient space for an object of type 'char'
which happens when mask == 0, len == 0 and we allocate zero elements.
Eventually, result[0] is called which triggers the UBSAN.
It's newly discovered after the Siddhesh's recent patch.
Cheers,
Martin
gcc/ChangeLog:
* opts-global.cc (write_langs): Allocate at least one byte.
---
gcc/opts-global.cc | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/gcc/opts-global.cc b/gcc/opts-global.cc
index a18c76940f9..4f5f8cdcb98 100644
--- a/gcc/opts-global.cc
+++ b/gcc/opts-global.cc
@@ -61,7 +61,7 @@ write_langs (unsigned int mask)
if (mask & (1U << n))
len += strlen (lang_name) + 1;
- result = XNEWVEC (char, len);
+ result = XNEWVEC (char, MAX (1, len));
len = 0;
for (n = 0; (lang_name = lang_names[n]) != 0; n++)
if (mask & (1U << n))
--
2.36.1
