diff mbox series

[net,1/4] netfilter: nftables: fix incorrect increment of loop counter

Message ID 20201218120409.3659-2-pablo@netfilter.org
State New
Headers show
Series Netfilter fixes for net | expand

Commit Message

Pablo Neira Ayuso Dec. 18, 2020, 12:04 p.m. UTC 
From: Colin Ian King <colin.king@canonical.com>

The intention of the err_expr cleanup path is to iterate over the
allocated expr_array objects and free them, starting from i - 1 and
working down to the start of the array. Currently the loop counter
is being incremented instead of decremented and also the index i is
being used instead of k, repeatedly destroying the same expr_array
element.  Fix this by decrementing k and using k as the index into
expr_array.

Addresses-Coverity: ("Infinite loop")
Fixes: 8cfd9b0f8515 ("netfilter: nftables: generalize set expressions support")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/nf_tables_api.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Comments

patchwork-bot+netdevbpf@kernel.org Dec. 19, 2020, 2:20 a.m. UTC | #1 
Hello:

This series was applied to netdev/net.git (refs/heads/master):

On Fri, 18 Dec 2020 13:04:06 +0100 you wrote:
> From: Colin Ian King <colin.king@canonical.com>

> 

> The intention of the err_expr cleanup path is to iterate over the

> allocated expr_array objects and free them, starting from i - 1 and

> working down to the start of the array. Currently the loop counter

> is being incremented instead of decremented and also the index i is

> being used instead of k, repeatedly destroying the same expr_array

> element.  Fix this by decrementing k and using k as the index into

> expr_array.

> 

> [...]


Here is the summary with links:
  - [net,1/4] netfilter: nftables: fix incorrect increment of loop counter
    https://git.kernel.org/netdev/net/c/161b838e25c6
  - [net,2/4] netfilter: x_tables: Update remaining dereference to RCU
    https://git.kernel.org/netdev/net/c/443d6e86f821
  - [net,3/4] netfilter: ipset: fixes possible oops in mtype_resize
    https://git.kernel.org/netdev/net/c/2b33d6ffa9e3
  - [net,4/4] netfilter: ipset: fix shift-out-of-bounds in htable_bits()
    https://git.kernel.org/netdev/net/c/5c8193f568ae

You are awesome, thank you!
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diff mbox series

Patch

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 8d5aa0ac45f4..4186b1e52d58 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -5254,8 +5254,8 @@  static int nft_set_elem_expr_clone(const struct nft_ctx *ctx,
 	return 0;
 
 err_expr:
-	for (k = i - 1; k >= 0; k++)
-		nft_expr_destroy(ctx, expr_array[i]);
+	for (k = i - 1; k >= 0; k--)
+		nft_expr_destroy(ctx, expr_array[k]);
 
 	return -ENOMEM;
 }