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Improve memory allocation following pattern in mdb_col_to_string.

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This commit is contained in:
Andy Reagan 2021-12-06 09:44:30 -05:00
parent 57cd54f654
commit 88caaa2004
1 changed files with 12 additions and 8 deletions
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20
src/libmdb/data.c
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@ -937,16 +937,20 @@ static char *
mdb_date_to_string(MdbHandle *mdb, const char *fmt, void *buf, int start)
{
struct tm t = { 0 };
char *text = g_malloc(mdb->bind_size);
char *text = NULL;
double td = mdb_get_double(buf, start);
// limit to ~1100AD--2700A to protect from overflow
if (td < -1e6 || td > 1e6)
return strdup("");
mdb_date_to_tm(td, &t);
strftime(text, mdb->bind_size, mdb->date_fmt, &t);
// limit dates to protect from overflow.
// 1e6 days is ~2700 years, centered at 1900, so this range is:
// Sunday, February 4, 839 BC to Tuesday, November 28, 4637
if (td < -1e6 || td > 1e6) {
// an "invalid date" would perhaps be better than null (TODO)
text = g_strdup("");
} else {
text = g_malloc(mdb->bind_size);
mdb_date_to_tm(td, &t);
strftime(text, mdb->bind_size, mdb->date_fmt, &t);
}
return text;
}