diff options
| author | Ursula Braun <ursula.braun@de.ibm.com> | 2013-11-06 09:04:52 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-12-04 10:50:30 -0800 |
| commit | 401a0f388620de353625f3bc4c06916fd94122f0 (patch) | |
| tree | 3a80c987efff8c564bb3d8cc5abd5a8e0c7f3bbd | |
| parent | dca32a77c5eb1d824e36e459c52a4a4b1901d39a (diff) | |
qeth: avoid buffer overflow in snmp ioctl
commit 6fb392b1a63ae36c31f62bc3fc8630b49d602b62 upstream.
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@de.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Reviewed-by: Heiko Carstens <heicars2@linux.vnet.ibm.com>
Reported-by: Nico Golde <nico@ngolde.de>
Reported-by: Fabian Yamaguchi <fabs@goesec.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/s390/net/qeth_core_main.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c index 8334dadc681d..be56590b750e 100644 --- a/drivers/s390/net/qeth_core_main.c +++ b/drivers/s390/net/qeth_core_main.c @@ -4357,7 +4357,7 @@ 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; @@ -4373,6 +4373,10 @@ 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"); |