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| author | Alex Henrie <alexhenrie24@gmail.com> | 2023-08-31 22:41:27 -0600 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-09-04 07:07:30 +0100 |
| commit | f31867d0d9d82af757c1e0178b659438f4c1ea3c (patch) | |
| tree | 36ddf17125eeed141d28e332f496b45dd9835853 | |
| parent | 151e887d8ff97e2e42110ffa1fb1e6a2128fb364 (diff) | |
| download | linux-f31867d0d9d82af757c1e0178b659438f4c1ea3c.tar.gz linux-f31867d0d9d82af757c1e0178b659438f4c1ea3c.tar.bz2 linux-f31867d0d9d82af757c1e0178b659438f4c1ea3c.zip | |
net: ipv6/addrconf: avoid integer underflow in ipv6_create_tempaddr
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: 76506a986dc3 ("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>
| -rw-r--r-- | net/ipv6/addrconf.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index 47d1dd8501b7..85cdbc252654 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -1378,7 +1378,7 @@ retry: * 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); |