airo: fix transmit_802_11_packet()

a) gaplen would better be stored little-endian
b) for control packets (shorter than 24-byte header) we ended up with
        bap_write(ai, hdrlen == 30 ?
                (const u16*)&gap.gaplen : (const u16*)&gap, 38 - hdrlen, BAP1);
passing to card the data past the end of gap (i.e. random stuff from stack)
and did _not_ feed the gaplen at the right offset.
c) sending the contents of uninitialized fields of struct is Not Nice(tm) either

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 3 insertions, 8 deletions

diff --git a/drivers/net/wireless/airo.c b/drivers/net/wireless/airo.c
index be9aa4efeca5..24fa0d62efe4 100644
--- a/drivers/net/wireless/airo.c
+++ b/drivers/net/wireless/airo.c
@@ -4365,14 +4365,10 @@ static int transmit_802_11_packet(struct airo_info *ai, int len, char *pPacket)
         Cmd cmd;
         Resp rsp;
         int hdrlen;
-        struct {
-                u8 addr4[ETH_ALEN];
-                u16 gaplen;
-                u8 gap[6];
-        } gap;
+        static u8 tail[(30-10) + 2 + 6] = {[30-10] = 6};
+        /* padding of header to full size + le16 gaplen (6) + gaplen bytes */
         u16 txFid = len;
         len >>= 16;
-        gap.gaplen = 6;
 
         fc = le16_to_cpu(*(const u16*)pPacket);
         switch (fc & 0xc) {
@@ -4405,8 +4401,7 @@ static int transmit_802_11_packet(struct airo_info *ai, int len, char *pPacket)
         bap_write(ai, &payloadLen, sizeof(payloadLen),BAP1);
         if (bap_setup(ai, txFid, 0x0014, BAP1) != SUCCESS) return ERROR;
         bap_write(ai, (const u16*)pPacket, hdrlen, BAP1);
-        bap_write(ai, hdrlen == 30 ?
-                (const u16*)&gap.gaplen : (const u16*)&gap, 38 - hdrlen, BAP1);
+        bap_write(ai, (u16 *)(tail + (hdrlen - 10)), 38 - hdrlen, BAP1);
 
         bap_write(ai, (const u16*)(pPacket + hdrlen), len - hdrlen, BAP1);
         // issue the transmit command