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-rw-r--r--print-vtp.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/print-vtp.c b/print-vtp.c
index d153cc19a5fd..d69c4093e977 100644
--- a/print-vtp.c
+++ b/print-vtp.c
@@ -241,7 +241,7 @@ vtp_print (netdissect_options *ndo,
*/
tptr += 4;
- while (tptr < (pptr+length)) {
+ while ((unsigned)(tptr - pptr) < length) {
ND_TCHECK_8BITS(tptr);
len = *tptr;