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Fix ubsan error in opts-global.cc

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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.

gcc/ChangeLog:

	* opts-global.cc (write_langs): Allocate at least one byte.
This commit is contained in:
Martin Liska 2022-05-16 09:48:27 +02:00
parent 9a53101caa
commit ec69db6be6
1 changed files with 1 additions and 1 deletions
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2
gcc/opts-global.cc
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@ -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))