From 819a100846295461bc0f1bfcb8e5ab11c1bc4cdb Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Mon, 26 Mar 2012 21:20:48 +0000 Subject: mISDN: array underflow in open_bchannel() There are two channels here. User space starts counting channels at one but in the kernel we start at zero. If the user passes in a zero channel that's invalid and could lead to memory corruption. Signed-off-by: Dan Carpenter Signed-off-by: David S. Miller --- drivers/isdn/hardware/mISDN/avmfritz.c | 2 +- drivers/isdn/hardware/mISDN/hfcpci.c | 2 +- drivers/isdn/hardware/mISDN/hfcsusb.c | 2 +- drivers/isdn/hardware/mISDN/mISDNipac.c | 2 +- drivers/isdn/hardware/mISDN/mISDNisar.c | 2 +- drivers/isdn/hardware/mISDN/netjet.c | 2 +- drivers/isdn/hardware/mISDN/w6692.c | 2 +- 7 files changed, 7 insertions(+), 7 deletions(-) (limited to 'drivers/isdn') diff --git a/drivers/isdn/hardware/mISDN/avmfritz.c b/drivers/isdn/hardware/mISDN/avmfritz.c index 05ed4d0cb18..c0b8c960ee3 100644 --- a/drivers/isdn/hardware/mISDN/avmfritz.c +++ b/drivers/isdn/hardware/mISDN/avmfritz.c @@ -891,7 +891,7 @@ open_bchannel(struct fritzcard *fc, struct channel_req *rq) { struct bchannel *bch; - if (rq->adr.channel > 2) + if (rq->adr.channel == 0 || rq->adr.channel > 2) return -EINVAL; if (rq->protocol == ISDN_P_NONE) return -EINVAL; diff --git a/drivers/isdn/hardware/mISDN/hfcpci.c b/drivers/isdn/hardware/mISDN/hfcpci.c index d055ae7fa04..e2c83a2d769 100644 --- a/drivers/isdn/hardware/mISDN/hfcpci.c +++ b/drivers/isdn/hardware/mISDN/hfcpci.c @@ -1962,7 +1962,7 @@ open_bchannel(struct hfc_pci *hc, struct channel_req *rq) { struct bchannel *bch; - if (rq->adr.channel > 2) + if (rq->adr.channel == 0 || rq->adr.channel > 2) return -EINVAL; if (rq->protocol == ISDN_P_NONE) return -EINVAL; diff --git a/drivers/isdn/hardware/mISDN/hfcsusb.c b/drivers/isdn/hardware/mISDN/hfcsusb.c index 60233873463..8cde2a0538a 100644 --- a/drivers/isdn/hardware/mISDN/hfcsusb.c +++ b/drivers/isdn/hardware/mISDN/hfcsusb.c @@ -486,7 +486,7 @@ open_bchannel(struct hfcsusb *hw, struct channel_req *rq) { struct bchannel *bch; - if (rq->adr.channel > 2) + if (rq->adr.channel == 0 || rq->adr.channel > 2) return -EINVAL; if (rq->protocol == ISDN_P_NONE) return -EINVAL; diff --git a/drivers/isdn/hardware/mISDN/mISDNipac.c b/drivers/isdn/hardware/mISDN/mISDNipac.c index b47e9bed218..884369f09ca 100644 --- a/drivers/isdn/hardware/mISDN/mISDNipac.c +++ b/drivers/isdn/hardware/mISDN/mISDNipac.c @@ -1506,7 +1506,7 @@ open_bchannel(struct ipac_hw *ipac, struct channel_req *rq) { struct bchannel *bch; - if (rq->adr.channel > 2) + if (rq->adr.channel == 0 || rq->adr.channel > 2) return -EINVAL; if (rq->protocol == ISDN_P_NONE) return -EINVAL; diff --git a/drivers/isdn/hardware/mISDN/mISDNisar.c b/drivers/isdn/hardware/mISDN/mISDNisar.c index 10446ab404b..9a6da6edcfa 100644 --- a/drivers/isdn/hardware/mISDN/mISDNisar.c +++ b/drivers/isdn/hardware/mISDN/mISDNisar.c @@ -1670,7 +1670,7 @@ isar_open(struct isar_hw *isar, struct channel_req *rq) { struct bchannel *bch; - if (rq->adr.channel > 2) + if (rq->adr.channel == 0 || rq->adr.channel > 2) return -EINVAL; if (rq->protocol == ISDN_P_NONE) return -EINVAL; diff --git a/drivers/isdn/hardware/mISDN/netjet.c b/drivers/isdn/hardware/mISDN/netjet.c index dd6de9f7a8a..c726e09d098 100644 --- a/drivers/isdn/hardware/mISDN/netjet.c +++ b/drivers/isdn/hardware/mISDN/netjet.c @@ -860,7 +860,7 @@ open_bchannel(struct tiger_hw *card, struct channel_req *rq) { struct bchannel *bch; - if (rq->adr.channel > 2) + if (rq->adr.channel == 0 || rq->adr.channel > 2) return -EINVAL; if (rq->protocol == ISDN_P_NONE) return -EINVAL; diff --git a/drivers/isdn/hardware/mISDN/w6692.c b/drivers/isdn/hardware/mISDN/w6692.c index 7f1e7ba75cd..2183357f079 100644 --- a/drivers/isdn/hardware/mISDN/w6692.c +++ b/drivers/isdn/hardware/mISDN/w6692.c @@ -1015,7 +1015,7 @@ open_bchannel(struct w6692_hw *card, struct channel_req *rq) { struct bchannel *bch; - if (rq->adr.channel > 2) + if (rq->adr.channel == 0 || rq->adr.channel > 2) return -EINVAL; if (rq->protocol == ISDN_P_NONE) return -EINVAL; -- cgit v1.2.3