diff options
| author | Ursula Braun <ursula.braun@de.ibm.com> | 2013-11-06 08:04:52 +0000 |
|---|---|---|
| committer | Willy Tarreau <w@1wt.eu> | 2014-05-19 07:54:34 +0200 |
| commit | 857c509645568201e67c3566a8293fd7b9e7cf94 (patch) | |
| tree | 262502e3a664a85a6f8b8816341c08036be6ca00 | |
| parent | e3123670efb2e10e536fa7fe752d72a4ca5bce9a (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>
Cc: <stable@vger.kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
[jmm: backport 2.6.32]
Signed-off-by: Willy Tarreau <w@1wt.eu>
| -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 c4a42d97015..29afd6c5c54 100644 --- a/drivers/s390/net/qeth_core_main.c +++ b/drivers/s390/net/qeth_core_main.c @@ -3557,7 +3557,7 @@ 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; @@ -3573,6 +3573,10 @@ 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 = kmalloc(req_len+sizeof(struct qeth_snmp_ureq_hdr), GFP_KERNEL); if (!ureq) { QETH_DBF_TEXT(TRACE, 2, "snmpnome"); |