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-rw-r--r--writecap/pcapio.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/writecap/pcapio.c b/writecap/pcapio.c
index e5a8c9de..58c49179 100644
--- a/writecap/pcapio.c
+++ b/writecap/pcapio.c
@@ -425,7 +425,7 @@ pcapng_write_interface_description_block(FILE* pfile,
}
/* 11 - IDB_FILTER */
- if ((filter != NULL) && (strlen(filter) > 0) && (strlen(filter) < UINT16_MAX)) {
+ if ((filter != NULL) && (strlen(filter) > 0) && (strlen(filter) < UINT16_MAX - 1)) {
/* No, this isn't a string, it has an extra type byte */
options_length += (uint32_t)(sizeof(struct ws_option) +
(uint16_t)(ADD_PADDING(strlen(filter)+ 1)));
@@ -496,7 +496,8 @@ pcapng_write_interface_description_block(FILE* pfile,
}
/* 11 - IDB_FILTER - write filter string if applicable
- * We only write version 1 of the filter, pcapng string
+ * We write out the libpcap filter expression, not the
+ * generated BPF code.
*/
if ((filter != NULL) && (strlen(filter) > 0) && (strlen(filter) < UINT16_MAX - 1)) {
option.type = IDB_FILTER;