This patch correctly checks, if enough data bytes for parsing IEs are
present (-2 in check for type and length). Furthermore, it adds a
nullptr and length check to ease future fuzzing.
Signed-off-by: Markus Theil <markus.theil@xxxxxxxxxxxxx>
---
scan.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/scan.c b/scan.c
index a6cb3bb..14138ca 100644
--- a/scan.c
+++ b/scan.c
@@ -2181,7 +2181,10 @@ void print_ies(unsigned char *ie, int ielen, bool unknown,
.ie = ie,
.ielen = ielen };
- while (ielen >= 2 && ielen >= ie[1]) {
+ if (ie == NULL || ielen < 0)
+ return;
+
+ while (ielen >= 2 && ielen - 2 >= ie[1]) {
if (ie[0] < ARRAY_SIZE(ieprinters) &&
ieprinters[ie[0]].name &&
ieprinters[ie[0]].flags & BIT(ptype)) {
--
2.25.0
