Commit 55494264 authored by Julian Wiedmann's avatar Julian Wiedmann Committed by David S. Miller

s390/qeth: check size of required HW header cache object

When qeth_add_hw_header() falls back to the header cache, ensure that
the requested length doesn't exceed the object size.

For current usage this is a no-brainer, but TSO transmission will
introduce protocol headers of varying length.
Signed-off-by: default avatarJulian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 2d3986d1
......@@ -16,6 +16,7 @@
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/log2.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/mii.h>
......@@ -3844,6 +3845,8 @@ int qeth_hdr_chk_and_bounce(struct sk_buff *skb, struct qeth_hdr **hdr, int len)
}
EXPORT_SYMBOL_GPL(qeth_hdr_chk_and_bounce);
#define QETH_HDR_CACHE_OBJ_SIZE (sizeof(struct qeth_hdr) + ETH_HLEN)
/**
* qeth_add_hw_header() - add a HW header to an skb.
* @skb: skb that the HW header should be added to.
......@@ -3918,6 +3921,8 @@ int qeth_add_hw_header(struct qeth_card *card, struct sk_buff *skb,
return hdr_len;
}
/* fall back */
if (hdr_len + proto_len > QETH_HDR_CACHE_OBJ_SIZE)
return -E2BIG;
*hdr = kmem_cache_alloc(qeth_core_header_cache, GFP_ATOMIC);
if (!*hdr)
return -ENOMEM;
......@@ -6661,8 +6666,10 @@ static int __init qeth_core_init(void)
rc = PTR_ERR_OR_ZERO(qeth_core_root_dev);
if (rc)
goto register_err;
qeth_core_header_cache = kmem_cache_create("qeth_hdr",
sizeof(struct qeth_hdr) + ETH_HLEN, 64, 0, NULL);
qeth_core_header_cache =
kmem_cache_create("qeth_hdr", QETH_HDR_CACHE_OBJ_SIZE,
roundup_pow_of_two(QETH_HDR_CACHE_OBJ_SIZE),
0, NULL);
if (!qeth_core_header_cache) {
rc = -ENOMEM;
goto slab_err;
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment