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authorJason Liu <r64343@freescale.com>2010-11-14 12:23:09 +0800
committerWolfgang Denk <wd@denx.de>2010-11-14 23:29:29 +0100
commit258ccd68170b7279ec7d4805c7b914c90374e711 (patch)
tree65294dbbf384b7b2fd5b458e9c8457d65ee679cd /net/bootp.c
parent6d1d51b32b9dc26be42ab95a61346050f9de7665 (diff)
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net: Fix potential empty DHCP Parameter Request List
Can't get IP address with dhcp due to the dhcp server not allow the empty param list request under some network env This patch is based on Gray Remlin's initial patch. Signed-off-by: Jason Liu <r64343@freescale.com> Signed-off-by: Gray Remlin <g_remlin@rocketmail.com>
Diffstat (limited to 'net/bootp.c')
-rw-r--r--net/bootp.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/net/bootp.c b/net/bootp.c
index e679f8b..1a71786 100644
--- a/net/bootp.c
+++ b/net/bootp.c
@@ -456,6 +456,10 @@ static int DhcpExtended (u8 * e, int message_type, IPaddr_t ServerID, IPaddr_t R
*e++ = 42;
*cnt += 1;
#endif
+ /* no options, so back up to avoid sending an empty request list */
+ if (*cnt == 0)
+ e -= 2;
+
*e++ = 255; /* End of the list */
/* Pad to minimal length */