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6lowpan: iphc: Fix an off-by-one check of array index 

[ Upstream commit 9af417610b6142e826fd1ee8ba7ff3e9a2133a5a ]

The bounds check of id is off-by-one and the comparison should
be >= rather >. Currently the WARN_ON_ONCE check does not stop
the out of range indexing of &ldev->ctx.table[id] so also add
a return path if the bounds are out of range.

Addresses-Coverity: ("Illegal address computation").
Fixes: 5609c185f2 ("6lowpan: iphc: add support for stateful compression")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Colin Ian King 2021-07-12 13:14:40 +01:00 committed by Greg Kroah-Hartman
parent c4895cf45f
commit bd1cd32caa
1 changed files with 2 additions and 1 deletions
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3
net/6lowpan/debugfs.c
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@ -170,7 +170,8 @@ static void lowpan_dev_debugfs_ctx_init(struct net_device *dev,
struct dentry *root;
char buf[32];
WARN_ON_ONCE(id > LOWPAN_IPHC_CTX_TABLE_SIZE);
if (WARN_ON_ONCE(id >= LOWPAN_IPHC_CTX_TABLE_SIZE))
return;
sprintf(buf, "%d", id);