[PATCH] coverity: ipmi_msghandler() channels array overrun fix

We fix the check in 1084, which was

1084 			if (addr->channel > IPMI_NUM_CHANNELS) {
1085 				spin_lock_irqsave(&intf->counter_lock, flags);
1086 				intf->sent_invalid_commands++;
1087 				spin_unlock_irqrestore(&intf->counter_lock, flags);
1088 				rv = -EINVAL;
1089 				goto out_err;
1090 			}

addr->channel is used in

1092 			if (intf->channels[addr->channel].medium

Definitions involved:

221  		struct ipmi_channel channels[IPMI_MAX_CHANNELS];

134  	#define IPMI_MAX_CHANNELS       8

In /linux-2.6.12-rc6/include/linux/ipmi.h
148  	#define IPMI_NUM_CHANNELS 0x10

Signed-off-by: Zaur Kambarov <zkambarov@coverity.com>
Cc: Corey Minyard <minyard@acm.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c
index 1813d0d198f12bee356b29dfb05d051d0878ef34..e16c13fe698dff7c71ad27508d64904f84be80be 100644 (file)
--- a/drivers/char/ipmi/ipmi_msghandler.c
+++ b/drivers/char/ipmi/ipmi_msghandler.c
@@ -1088,8 +1088,8 @@ static inline int i_ipmi_request(ipmi_user_t          user,
                long                  seqid;
                int                   broadcast = 0;
 
-               if (addr->channel > IPMI_NUM_CHANNELS) {
-                       spin_lock_irqsave(&intf->counter_lock, flags);
+               if (addr->channel >= IPMI_MAX_CHANNELS) {
+                       spin_lock_irqsave(&intf->counter_lock, flags);
                        intf->sent_invalid_commands++;
                        spin_unlock_irqrestore(&intf->counter_lock, flags);
                        rv = -EINVAL;