[PATCH net] qeth: avoid buffer overflow in snmp ioctl

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



From: Ursula Braun <ursula.braun@xxxxxxxxxx>

Check user-defined length in snmp ioctl request and allow request
only if it fits into a qeth command buffer.

Signed-off-by: Ursula Braun <ursula.braun@xxxxxxxxxx>
Signed-off-by: Frank Blaschka <frank.blaschka@xxxxxxxxxx>
Reviewed-by: Heiko Carstens <heicars2@xxxxxxxxxxxxxxxxxx>
Reported-by: Nico Golde <nico@xxxxxxxxx>
Reported-by: Fabian Yamaguchi <fabs@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
---
 drivers/s390/net/qeth_core_main.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index d7b66a2..642f623 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -4451,7 +4451,7 @@ int qeth_snmp_command(struct qeth_card *card, char __user *udata)
 	struct qeth_cmd_buffer *iob;
 	struct qeth_ipa_cmd *cmd;
 	struct qeth_snmp_ureq *ureq;
-	int req_len;
+	unsigned int req_len;
 	struct qeth_arp_query_info qinfo = {0, };
 	int rc = 0;
 
@@ -4467,6 +4467,10 @@ int qeth_snmp_command(struct qeth_card *card, char __user *udata)
 	/* skip 4 bytes (data_len struct member) to get req_len */
 	if (copy_from_user(&req_len, udata + sizeof(int), sizeof(int)))
 		return -EFAULT;
+	if (req_len > QETH_BUFSIZE - IPA_PDU_HEADER_SIZE
+				   - sizeof(struct qeth_ipacmd_hdr)
+				   - sizeof(struct qeth_ipacmd_setadpparms_hdr))
+		return -EINVAL;
 	ureq = memdup_user(udata, req_len + sizeof(struct qeth_snmp_ureq_hdr));
 	if (IS_ERR(ureq)) {
 		QETH_CARD_TEXT(card, 2, "snmpnome");

--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Linux Kernel]     [Kernel Development Newbies]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite Hiking]     [Linux Kernel]     [Linux SCSI]