From: joao@overdrivepizza.com
To: pablo@netfilter.org, netfilter-devel@vger.kernel.org,
coreteam@netfilter.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, joao@overdrivepizza.com
Cc: kadlec@netfilter.org, fw@strlen.de, davem@davemloft.net,
edumazet@google.com, kuba@kernel.org, pabeni@redhat.com,
rkannoth@marvell.com, wojciech.drewek@intel.com,
steen.hegenlund@microhip.com, keescook@chromium.org,
Joao Moreira <joao.moreira@intel.com>
Subject: [PATCH 1/2] Make loop indexes unsigned
Date: Thu, 31 Aug 2023 18:04:36 -0700 [thread overview]
Message-ID: <20230901010437.126631-2-joao@overdrivepizza.com> (raw)
In-Reply-To: <20230901010437.126631-1-joao@overdrivepizza.com>
From: Joao Moreira <joao.moreira@intel.com>
Both flow_rule_alloc and offload_action_alloc functions received an
unsigned num_actions parameters which are then operated within a loop.
The index of this loop is declared as a signed int. If it was possible
to pass a large enough num_actions to these functions, it would lead to
an out of bounds write.
After checking with maintainers, it was mentioned that front-end will
cap the num_actions value and that it is not possible to reach this
function with such a large number. Yet, for correctness, it is still
better to fix this.
Signed-off-by: Joao Moreira <joao.moreira@intel.com>
---
net/core/flow_offload.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/net/core/flow_offload.c b/net/core/flow_offload.c
index bc5169482710..bc3f53a09d8f 100644
--- a/net/core/flow_offload.c
+++ b/net/core/flow_offload.c
@@ -10,7 +10,7 @@
struct flow_rule *flow_rule_alloc(unsigned int num_actions)
{
struct flow_rule *rule;
- int i;
+ unsigned int i;
rule = kzalloc(struct_size(rule, action.entries, num_actions),
GFP_KERNEL);
@@ -31,7 +31,7 @@ EXPORT_SYMBOL(flow_rule_alloc);
struct flow_offload_action *offload_action_alloc(unsigned int num_actions)
{
struct flow_offload_action *fl_action;
- int i;
+ unsigned int i;
fl_action = kzalloc(struct_size(fl_action, action.entries, num_actions),
GFP_KERNEL);
--
2.41.0
next prev parent reply other threads:[~2023-09-01 1:04 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-01 1:04 [PATCH 0/2] Prevent potential write out of bounds joao
2023-09-01 1:04 ` joao [this message]
2023-09-01 1:04 ` [PATCH 2/2] Ensure num_actions is not a negative joao
2023-09-01 8:58 ` Pablo Neira Ayuso
2023-09-01 1:28 ` [PATCH 0/2] Prevent potential write out of bounds Jakub Kicinski
2023-09-01 5:46 ` Joao Moreira
2023-09-01 8:15 ` Pablo Neira Ayuso
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