batctl/patches/0002-batctl-fix-endianness-when-reading-radiotap-header.patch

   1 From: Marek Lindner <mareklindner@neomailbox.ch>
   2 Date: Wed, 29 Apr 2020 12:09:44 +0200
   3 Subject: batctl: fix endianness when reading radiotap header
   4
   5 All radiotap header fields are specified in little endian byte-order.
   6 Header length conversion is necessary on some platforms.
   7
   8 Fixes: c6fcdb6dc9a9 ("batctl: add radiotap wifi packet decapsulation support")
   9 Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
  10 Signed-off-by: Sven Eckelmann <sven@narfation.org>
  11
  12 Origin: upstream, https://git.open-mesh.org/batctl.git/commit/440ae55a6ef96eb73ee628f9237915cf9fb26dee
  13
  14 diff --git a/tcpdump.c b/tcpdump.c
  15 index dc4ccd37c3ddf8650cb79737defd923fe9f33c64..c41500e21eda0abc1f024a3265c23fc3a4802d17 100644
  16 --- a/tcpdump.c
  17 +++ b/tcpdump.c
  18 @@ -29,6 +29,7 @@
  19  #include <time.h>
  20  #include <sys/time.h>
  21  #include <arpa/inet.h>
  22 +#include <endian.h>
  23  #include <net/if.h>
  24  #include <net/if_arp.h>
  25  #include <netinet/in.h>
  26 @@ -1048,10 +1049,10 @@ static int monitor_header_length(unsigned char *packet_buff, ssize_t buff_len, i
  27                         return -1;
  28
  29                 radiotap_hdr = (struct radiotap_header*)packet_buff;
  30 -               if (buff_len <= radiotap_hdr->it_len)
  31 +               if (buff_len <= le16toh(radiotap_hdr->it_len))
  32                         return -1;
  33                 else
  34 -                       return radiotap_hdr->it_len;
  35 +                       return le16toh(radiotap_hdr->it_len);
  36         }
  37
  38         return -1;