Repository : ssh://git@diktynna/batctl On branch : master commit 440ae55a6ef96eb73ee628f9237915cf9fb26dee Author: Marek Lindner &lt;mareklindner(a)neomailbox.ch&gt; Date: Wed Apr 29 12:09:44 2020 +0200 batctl: fix endianness when reading radiotap header All radiotap header fields are specified in little endian byte-order. Header length conversion is necessary on some platforms. Fixes: c6fcdb6dc9a9 ("batctl: add radiotap wifi packet decapsulation support") Signed-off-by: Marek Lindner &lt;mareklindner(a)neomailbox.ch&gt; Signed-off-by: Sven Eckelmann &lt;sven(a)narfation.org&gt; 440ae55a6ef96eb73ee628f9237915cf9fb26dee tcpdump.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/tcpdump.c b/tcpdump.c index 4b9e4f6..db93681 100644 --- a/tcpdump.c +++ b/tcpdump.c @@ -15,6 +15,7 @@ #include <time.h> #include <sys/time.h> #include <arpa/inet.h> +#include <endian.h> #include <net/if.h> #include <net/if_arp.h> #include <netinet/in.h> @@ -1144,10 +1145,10 @@ static int monitor_header_length(unsigned char *packet_buff, ssize_t buff_len, i return -1; radiotap_hdr = (struct radiotap_header*)packet_buff; - if (buff_len <= radiotap_hdr->it_len) + if (buff_len <= le16toh(radiotap_hdr->it_len)) return -1; else - return radiotap_hdr->it_len; + return le16toh(radiotap_hdr->it_len); } return -1;