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[net,v1,2/2] RDMA/nldev: specify the nested length of RDMA_NLDEV_ATTR_STAT_HWCOUNTERS

Message ID 20230731121324.3973136-1-linma@zju.edu.cn (mailing list archive)
State Not Applicable
Headers show
Series [net,v1,1/2] netlink: let len field used to parse type-not-care nested attrs | expand

Commit Message

Lin Ma July 31, 2023, 12:13 p.m. UTC 
The nla_for_each_nested parsing in function
nldev_stat_set_counter_dynamic_doit() does not check the length of the
attribute. This can lead to an out-of-attribute read and allow a
malformed nlattr (e.g., length 0) to be viewed as a 4 byte integer.

This patch leverages the newly introduced NLA_POLICY_NESTED_NO_TYPE
which sets the len field in nla_policy and allows the nlmsg_parse in
function nldev_stat_set_doit checks the nested length.

Fixes: 3c3c1f141639 ("RDMA/nldev: Allow optional-counter status configuration through RDMA netlink")
Signed-off-by: Lin Ma <linma@zju.edu.cn>
---
 drivers/infiniband/core/nldev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/drivers/infiniband/core/nldev.c b/drivers/infiniband/core/nldev.c
index d5d3e4f0de77..c33eacc18d97 100644
--- a/drivers/infiniband/core/nldev.c
+++ b/drivers/infiniband/core/nldev.c
@@ -145,7 +145,7 @@  static const struct nla_policy nldev_policy[RDMA_NLDEV_ATTR_MAX] = {
 	[RDMA_NLDEV_ATTR_STAT_COUNTER]		= { .type = NLA_NESTED },
 	[RDMA_NLDEV_ATTR_STAT_COUNTER_ENTRY]	= { .type = NLA_NESTED },
 	[RDMA_NLDEV_ATTR_STAT_COUNTER_ID]       = { .type = NLA_U32 },
-	[RDMA_NLDEV_ATTR_STAT_HWCOUNTERS]       = { .type = NLA_NESTED },
+	[RDMA_NLDEV_ATTR_STAT_HWCOUNTERS]       = NLA_POLICY_NESTED_NO_TYPE(sizeof(u32)),
 	[RDMA_NLDEV_ATTR_STAT_HWCOUNTER_ENTRY]  = { .type = NLA_NESTED },
 	[RDMA_NLDEV_ATTR_STAT_HWCOUNTER_ENTRY_NAME] = { .type = NLA_NUL_STRING },
 	[RDMA_NLDEV_ATTR_STAT_HWCOUNTER_ENTRY_VALUE] = { .type = NLA_U64 },