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netlink: Do not subscribe to non-existent groups
[ Upstream commit 7acf9d4237c46894e0fa0492dd96314a41742e84 ] Make ABI more strict about subscribing to group > ngroups. Code doesn't check for that and it looks bogus. (one can subscribe to non-existing group) Still, it's possible to bind() to all possible groups with (-1) Cc: "David S. Miller" <[email protected]> Cc: Herbert Xu <[email protected]> Cc: Steffen Klassert <[email protected]> Cc: [email protected] Signed-off-by: Dmitry Safonov <[email protected]> Signed-off-by: David S. Miller <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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