Description of problem:
Tried a new kernel and it crashed on iwconfig of my iwl3945 card.

Version-Release number of selected component (if applicable):
kernel-2.6.23.15-137.fc8.x86_64

kernel-2.6.23.14-107.fc8.x86_64 (this one works for me)

How reproducible:
Tried only once.

Steps to Reproduce:
My startup scripts contain these iwconfig commands:
  modprobe iwl3945
  sleep 2
  iwconfig wlan0 essid "foo"
  iwconfig wlan0 ap "00:4F:62:17:E3:55" 
  iwconfig wlan0 rts 0
  iwconfig wlan0 rate 2M

Actual results:
Unable to handle kernel NULL pointer dereference at 0000000000000028 RIP:
 [<ffffffff88468b05>] :mac80211:ieee80211_ioctl_siwrate+0x71/0xc0
PGD 4fe9f067 PUD 507f5067 PMD 0
Oops: 0000 [1] SMP
CPU 0
Modules linked in: iwl3945 mac80211 nf_conntrack_sane nf_conntrack_proto_udplite
nf_conntrack_proto_sctp nf_conntrack_netlink nf_nat_tftp nf_conntrack_tftp
nf_nat_snmp_basic nf_nat_sip nf_conntrack_sip nf_nat_pptp nf_conntrack_pptp
nf_conntrack_proto_gre nf_nat_proto_gre nf_nat_irc nf_conntrack_irc nf_nat_h323
nf_conntrack_h323 nf_nat_ftp nf_conntrack_ftp nf_nat_amanda ts_kmp
nf_conntrack_amanda nfsd exportfs lockd nfs_acl auth_rpcgss sunrpc tun rfcomm
l2cap ipv6 nf_conntrack_netbios_ns iptable_mangle ipt_MASQUERADE iptable_nat
nf_nat ipt_REJECT nf_conntrack_ipv4 xt_conntrack nf_conntrack nfnetlink
xt_tcpudp iptable_filter ip_tables x_tables cpufreq_ondemand acpi_cpufreq
dm_mirror dm_mod uinput kvm_intel kvm snd_usb_audio snd_seq_dummy snd_hda_intel
snd_seq_oss snd_seq_midi_event snd_seq snd_pcm_oss snd_mixer_oss snd_pcm
iTCO_wdt iTCO_vendor_support arc4 snd_timer ac thinkpad_acpi video ecb blkcipher
snd_usb_lib output i2c_i801 battery snd_rawmidi hci_usb button i2c_core pcspkr snd
_seq_device snd_page_alloc joydev snd_hwdep bluetooth snd cfg80211 hwmon
soundcore sg sr_mod cdrom ata_piix ahci libata sd_mod scsi_mod ext3 jbd mbcache
uhci_hcd ohci_hcd ehci_hcd
Pid: 10104, comm: iwconfig Not tainted 2.6.23.15-137.fc8 #1
RIP: 0010:[<ffffffff88468b05>]  [<ffffffff88468b05>]
:mac80211:ieee80211_ioctl_siwrate+0x71/0xc0
RSP: 0018:ffff810056b81cf8  EFLAGS: 00010202
RAX: ffff81007c86e920 RBX: 00000000000186a0 RCX: ffff81005786c780
RDX: ffff81007c86e920 RSI: ffff81007e760060 RDI: 0000000000000000
RBP: ffff810056b81e58 R08: ffff810056b81e58 R09: 0000000000000003
R10: 0000000000000014 R11: 0000000000000246 R12: 00000000ffffffa1
R13: ffffffff812983c0 R14: 0000000000008b20 R15: 0000000000000003
FS:  00002aaaaaac2f60(0000) GS:ffffffff813be000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000028 CR3: 000000005189a000 CR4: 00000000000026e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process iwconfig (pid: 10104, threadinfo ffff810056b80000, task ffff810069550000)
Stack:  0000000000000180 ffffffff81257c1c ffffffff88468a94 ffff81005786c000
 ffff81000000f2b0 ffff81004fe9f770 ffff810058456d10 0000000000000000
 ffff81000abdc4e0 ffffffff00000000 ffff81000abdc4e0 ffffffff8107e7c2
Call Trace:
 [<ffffffff81257c1c>] ioctl_standard_call+0x66/0x2ef
 [<ffffffff88468a94>] :mac80211:ieee80211_ioctl_siwrate+0x0/0xc0
 [<ffffffff8107e7c2>] __do_fault+0x44f/0x489
 [<ffffffff81257f56>] wext_handle_ioctl+0xb1/0x39d
 [<ffffffff88468a94>] :mac80211:ieee80211_ioctl_siwrate+0x0/0xc0
 [<ffffffff811f21cf>] dev_ioctl+0x418/0x43e
 [<ffffffff81121027>] __up_read+0x19/0x7f
 [<ffffffff811e5846>] sock_ioctl+0x1db/0x1e5
 [<ffffffff810a768d>] do_ioctl+0x21/0x6b
 [<ffffffff810a791a>] vfs_ioctl+0x243/0x25c
 [<ffffffff810a798c>] sys_ioctl+0x59/0x79
 [<ffffffff8100bd45>] tracesys+0xd5/0xda


Code: 44 8b 4f 28 31 f6 31 d2 eb 35 48 8b 47 18 8b 04 10 48 83 c2
RIP  [<ffffffff88468b05>] :mac80211:ieee80211_ioctl_siwrate+0x71/0xc0
 RSP <ffff810056b81cf8>
CR2: 0000000000000028

Expected results:
No crash.

Additional info:
I can try rebooting it again if it is required.