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rndis_host: fix oops when query for OID_GEN_PHYSICAL_MEDIUM fails

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When query for OID_GEN_PHYSICAL_MEDIUM fails, uninitialized pointer
'phym' is being accessed in generic_rndis_bind(), resulting OOPS.
Patch fixes phym to be initialized and setup correctly when
rndis_query() for physical medium fails.

Bug was introduced by following commit:
commit 039ee17d1baabaa21783a0d5ab3e8c6d8c794bdf
Author: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Date:   Sun Jan 27 23:34:33 2008 +0200

Reported-by: Dmitri Monakhov <dmonakhov@openvz.org>
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Jussi Kivilinna 2008-03-23 12:45:44 +02:00 committed by Jeff Garzik
parent b1186dee3e
commit 9f5e60dd5f
1 changed files with 6 additions and 3 deletions
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9
drivers/net/usb/rndis_host.c
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@ -283,7 +283,7 @@ generic_rndis_bind(struct usbnet *dev, struct usb_interface *intf, int flags)
struct rndis_set_c *set_c;
struct rndis_halt *halt;
} u;
u32 tmp, *phym;
u32 tmp, phym_unspec, *phym;
int reply_len;
unsigned char *bp;
@ -363,12 +363,15 @@ generic_rndis_bind(struct usbnet *dev, struct usb_interface *intf, int flags)
goto halt_fail_and_release;
/* Check physical medium */
phym = NULL;
reply_len = sizeof *phym;
retval = rndis_query(dev, intf, u.buf, OID_GEN_PHYSICAL_MEDIUM,
0, (void **) &phym, &reply_len);
if (retval != 0)
if (retval != 0 || !phym) {
/* OID is optional so don't fail here. */
*phym = RNDIS_PHYSICAL_MEDIUM_UNSPECIFIED;
phym_unspec = RNDIS_PHYSICAL_MEDIUM_UNSPECIFIED;
phym = &phym_unspec;
}
if ((flags & FLAG_RNDIS_PHYM_WIRELESS) &&
*phym != RNDIS_PHYSICAL_MEDIUM_WIRELESS_LAN) {
if (netif_msg_probe(dev))