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[nasal] remediate segfault in lib.c

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state of vaCopy is altered during each usage, so it needs to be discarded and not reused by multiple calls.
This commit is contained in:
Scott Giese 2019-06-15 11:54:35 -05:00
parent 3d841a214c
commit 3b3093c72e
1 changed files with 14 additions and 9 deletions
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23
simgear/nasal/lib.c
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@ -302,23 +302,28 @@ static naRef f_die(naContext c, naRef me, int argc, naRef* args)
static char* dosprintf(char* f, ...) static char* dosprintf(char* f, ...)
{ {
char* buf; char* buf;
va_list va; va_list va;
int len = 0;
va_start(va, f); va_start(va, f);
va_list vaCopy;
va_copy(vaCopy, va); int len = vsnprintf(0, 0, f, va);
len = vsnprintf(0, 0, f, vaCopy); va_end(va);
if (len <= 0) { if (len <= 0) {
buf = naAlloc(2); buf = (char *) naAlloc(2);
*buf = 0; *buf = 0;
} }
else { else {
len++;// allow for terminating null len++;// allow for terminating null
buf = naAlloc(len); buf = (char *) naAlloc(len);
len = vsnprintf(buf, len, f, vaCopy);
} va_list va;
va_start(va, f);
len = vsnprintf(buf, len, f, va);
va_end(va); va_end(va);
va_end(vaCopy); }
return buf; return buf;
} }