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net: dsa: sja1105: fix kasan out-of-bounds warning in sja1105_table_delete_entry()

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There are actually 2 problems:
- deleting the last element doesn't require the memmove of elements
  [i + 1, end) over it. Actually, element i+1 is out of bounds.
- The memmove itself should move size - i - 1 elements, because the last
  element is out of bounds.

The out-of-bounds element still remains out of bounds after being
accessed, so the problem is only that we touch it, not that it becomes
in active use. But I suppose it can lead to issues if the out-of-bounds
element is part of an unmapped page.

Fixes: 6666cebc5e30 ("net: dsa: sja1105: Add support for VLAN operations")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250318115716.2124395-4-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Vladimir Oltean 2025-03-18 13:57:16 +02:00 committed by Jakub Kicinski
parent b6a177b559
commit 5f2b28b79d
1 changed files with 4 additions and 2 deletions
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6
drivers/net/dsa/sja1105/sja1105_static_config.c
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@ -1917,8 +1917,10 @@ int sja1105_table_delete_entry(struct sja1105_table *table, int i)
if (i > table->entry_count)
return -ERANGE;
memmove(entries + i * entry_size, entries + (i + 1) * entry_size,
(table->entry_count - i) * entry_size);
if (i + 1 < table->entry_count) {
memmove(entries + i * entry_size, entries + (i + 1) * entry_size,
(table->entry_count - i - 1) * entry_size);
}
table->entry_count--;