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[PATCH] Open IPMI BT overflow

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I was looking into random driver code and found a suspicious looking
memcpy() in drivers/char/ipmi/ipmi_bt_sm.c on 2.6.17-rc1:

	if ((size < 2) || (size > IPMI_MAX_MSG_LENGTH))
		return -1;
	...
	memcpy(bt->write_data + 3, data + 1, size - 1);

where sizeof bt->write_data is IPMI_MAX_MSG_LENGTH.  It looks like the
memcpy would overflow by 2 bytes if size == IPMI_MAX_MSG_LENGTH.  A patch
attached to limit size to (IPMI_MAX_LENGTH - 2).

Cc: Corey Minyard <minyard@acm.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Heikki Orsila 2006-04-18 22:21:55 -07:00 committed by Linus Torvalds
parent aa1e816fc9
commit 3fb0cb5d0f
1 changed files with 1 additions and 1 deletions
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2
drivers/char/ipmi/ipmi_bt_sm.c
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@ -165,7 +165,7 @@ static int bt_start_transaction(struct si_sm_data *bt,
{
unsigned int i;
if ((size < 2) || (size > IPMI_MAX_MSG_LENGTH))
if ((size < 2) || (size > (IPMI_MAX_MSG_LENGTH - 2)))
return -1;
if ((bt->state != BT_STATE_IDLE) && (bt->state != BT_STATE_HOSED))