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can: gw: Use nla_policy to validate netlink attributes
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Also use nla_get_u32() instead of nla_memcpy() to access u32 attribtues.

Signed-off-by: Thomas Graf <[email protected]>
Tested-by: Oliver Hartkopp <[email protected]>
Acked-by: Oliver Hartkopp <[email protected]>
Signed-off-by: Marc Kleine-Budde <[email protected]>
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@tgraf @marckleinebudde
tgraf authored and marckleinebudde committed Jul 10, 2012
1 parent 6eaf53c commit 732d35f
Showing 1 changed file with 23 additions and 24 deletions.
47 changes: 23 additions & 24 deletions net/can/gw.c
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Original file line number Diff line number Diff line change
Expand Up @@ -558,6 +558,18 @@ static int cgw_dump_jobs(struct sk_buff *skb, struct netlink_callback *cb)
return skb->len;
}

static const struct nla_policy cgw_policy[CGW_MAX+1] = {
[CGW_MOD_AND] = { .len = sizeof(struct cgw_frame_mod) },
[CGW_MOD_OR] = { .len = sizeof(struct cgw_frame_mod) },
[CGW_MOD_XOR] = { .len = sizeof(struct cgw_frame_mod) },
[CGW_MOD_SET] = { .len = sizeof(struct cgw_frame_mod) },
[CGW_CS_XOR] = { .len = sizeof(struct cgw_csum_xor) },
[CGW_CS_CRC8] = { .len = sizeof(struct cgw_csum_crc8) },
[CGW_SRC_IF] = { .type = NLA_U32 },
[CGW_DST_IF] = { .type = NLA_U32 },
[CGW_FILTER] = { .len = sizeof(struct can_filter) },
};

/* check for common and gwtype specific attributes */
static int cgw_parse_attr(struct nlmsghdr *nlh, struct cf_mod *mod,
u8 gwtype, void *gwtypeattr)
Expand All @@ -570,14 +582,14 @@ static int cgw_parse_attr(struct nlmsghdr *nlh, struct cf_mod *mod,
/* initialize modification & checksum data space */
memset(mod, 0, sizeof(*mod));

err = nlmsg_parse(nlh, sizeof(struct rtcanmsg), tb, CGW_MAX, NULL);
err = nlmsg_parse(nlh, sizeof(struct rtcanmsg), tb, CGW_MAX,
cgw_policy);
if (err < 0)
return err;

/* check for AND/OR/XOR/SET modifications */

if (tb[CGW_MOD_AND] &&
nla_len(tb[CGW_MOD_AND]) == CGW_MODATTR_LEN) {
if (tb[CGW_MOD_AND]) {
nla_memcpy(&mb, tb[CGW_MOD_AND], CGW_MODATTR_LEN);

canframecpy(&mod->modframe.and, &mb.cf);
Expand All @@ -593,8 +605,7 @@ static int cgw_parse_attr(struct nlmsghdr *nlh, struct cf_mod *mod,
mod->modfunc[modidx++] = mod_and_data;
}

if (tb[CGW_MOD_OR] &&
nla_len(tb[CGW_MOD_OR]) == CGW_MODATTR_LEN) {
if (tb[CGW_MOD_OR]) {
nla_memcpy(&mb, tb[CGW_MOD_OR], CGW_MODATTR_LEN);

canframecpy(&mod->modframe.or, &mb.cf);
Expand All @@ -610,8 +621,7 @@ static int cgw_parse_attr(struct nlmsghdr *nlh, struct cf_mod *mod,
mod->modfunc[modidx++] = mod_or_data;
}

if (tb[CGW_MOD_XOR] &&
nla_len(tb[CGW_MOD_XOR]) == CGW_MODATTR_LEN) {
if (tb[CGW_MOD_XOR]) {
nla_memcpy(&mb, tb[CGW_MOD_XOR], CGW_MODATTR_LEN);

canframecpy(&mod->modframe.xor, &mb.cf);
Expand All @@ -627,8 +637,7 @@ static int cgw_parse_attr(struct nlmsghdr *nlh, struct cf_mod *mod,
mod->modfunc[modidx++] = mod_xor_data;
}

if (tb[CGW_MOD_SET] &&
nla_len(tb[CGW_MOD_SET]) == CGW_MODATTR_LEN) {
if (tb[CGW_MOD_SET]) {
nla_memcpy(&mb, tb[CGW_MOD_SET], CGW_MODATTR_LEN);

canframecpy(&mod->modframe.set, &mb.cf);
Expand All @@ -647,9 +656,7 @@ static int cgw_parse_attr(struct nlmsghdr *nlh, struct cf_mod *mod,
/* check for checksum operations after CAN frame modifications */
if (modidx) {

if (tb[CGW_CS_CRC8] &&
nla_len(tb[CGW_CS_CRC8]) == CGW_CS_CRC8_LEN) {

if (tb[CGW_CS_CRC8]) {
struct cgw_csum_crc8 *c = (struct cgw_csum_crc8 *)\
nla_data(tb[CGW_CS_CRC8]);

Expand All @@ -674,9 +681,7 @@ static int cgw_parse_attr(struct nlmsghdr *nlh, struct cf_mod *mod,
mod->csumfunc.crc8 = cgw_csum_crc8_neg;
}

if (tb[CGW_CS_XOR] &&
nla_len(tb[CGW_CS_XOR]) == CGW_CS_XOR_LEN) {

if (tb[CGW_CS_XOR]) {
struct cgw_csum_xor *c = (struct cgw_csum_xor *)\
nla_data(tb[CGW_CS_XOR]);

Expand Down Expand Up @@ -710,8 +715,7 @@ static int cgw_parse_attr(struct nlmsghdr *nlh, struct cf_mod *mod,
memset(ccgw, 0, sizeof(*ccgw));

/* check for can_filter in attributes */
if (tb[CGW_FILTER] &&
nla_len(tb[CGW_FILTER]) == sizeof(struct can_filter))
if (tb[CGW_FILTER])
nla_memcpy(&ccgw->filter, tb[CGW_FILTER],
sizeof(struct can_filter));

Expand All @@ -721,13 +725,8 @@ static int cgw_parse_attr(struct nlmsghdr *nlh, struct cf_mod *mod,
if (!tb[CGW_SRC_IF] || !tb[CGW_DST_IF])
return err;

if (nla_len(tb[CGW_SRC_IF]) == sizeof(u32))
nla_memcpy(&ccgw->src_idx, tb[CGW_SRC_IF],
sizeof(u32));

if (nla_len(tb[CGW_DST_IF]) == sizeof(u32))
nla_memcpy(&ccgw->dst_idx, tb[CGW_DST_IF],
sizeof(u32));
ccgw->src_idx = nla_get_u32(tb[CGW_SRC_IF]);
ccgw->dst_idx = nla_get_u32(tb[CGW_DST_IF]);

/* both indices set to 0 for flushing all routing entries */
if (!ccgw->src_idx && !ccgw->dst_idx)
Expand Down

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