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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2011-03-20 10:40:06 -0400 |
|---|---|---|
| committer | Patrick McHardy <kaber@trash.net> | 2011-03-20 10:40:06 -0400 |
| commit | db856674ac69e31946e56085239757cca3f7655f (patch) | |
| tree | 73fc82e92a119dcf1a0ce4e2ca45ef410165776f /net/ipv4/fib_frontend.c | |
| parent | 5c1aba467828bf0574ec5754c84884d573f590af (diff) | |
netfilter: xtables: fix reentrancy
commit f3c5c1bfd4308 (make ip_tables reentrant) introduced a race in
handling the stackptr restore, at the end of ipt_do_table()
We should do it before the call to xt_info_rdunlock_bh(), or we allow
cpu preemption and another cpu overwrites stackptr of original one.
A second fix is to change the underflow test to check the origptr value
instead of 0 to detect underflow, or else we allow a jump from different
hooks.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Diffstat (limited to 'net/ipv4/fib_frontend.c')
0 files changed, 0 insertions, 0 deletions