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net: ipv6/addrconf: avoid integer underflow in ipv6_create_tempaddr

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The existing code incorrectly casted a negative value (the result of a
subtraction) to an unsigned value without checking. For example, if
/proc/sys/net/ipv6/conf/*/temp_prefered_lft was set to 1, the preferred
lifetime would jump to 4 billion seconds. On my machine and network the
shortest lifetime that avoided underflow was 3 seconds.

Fixes: 76506a986d ("IPv6: fix DESYNC_FACTOR")
Signed-off-by: Alex Henrie <alexhenrie24@gmail.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alex Henrie 2023-08-31 22:41:27 -06:00 committed by David S. Miller
parent 151e887d8f
commit f31867d0d9
1 changed files with 1 additions and 1 deletions
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2
net/ipv6/addrconf.c
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@ -1378,7 +1378,7 @@ static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block)
* idev->desync_factor if it's larger
*/
cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
max_desync_factor = min_t(__u32,
max_desync_factor = min_t(long,
idev->cnf.max_desync_factor,
cnf_temp_preferred_lft - regen_advance);