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Code Issues 1 Releases Wiki Activity

check for NULL in get_fmt_mapping (fixes #1105)

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When there is no format to be found after a %, get_fmt_mapping returns
NULL. It then gets called against strlen, which is a typical SEGV.
Check for NULL aginst mapping, which signals a null format being
specified.
This commit is contained in:
Chloe Kudryavtsev 2023-04-19 12:55:25 -04:00
parent bef5bd72c2
commit f3192303ab
1 changed files with 1 additions and 0 deletions
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src/core/pp.c
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@ -811,6 +811,7 @@ static const char *scanformat(
while (p2 <= p) { while (p2 <= p) {
if (strchr(FMT_REPLACE_INTTYPES, *p2) != NULL) { if (strchr(FMT_REPLACE_INTTYPES, *p2) != NULL) {
const char *mapping = get_fmt_mapping(*p2++); const char *mapping = get_fmt_mapping(*p2++);
if (!mapping) janet_panic("invalid format (found null)");
size_t len = strlen(mapping); size_t len = strlen(mapping);
strcpy(form, mapping); strcpy(form, mapping);
form += len; form += len;