summaryrefslogtreecommitdiffstats
path: root/module/zfs/refcount.c
diff options
context:
space:
mode:
authorBrian Behlendorf <[email protected]>2011-11-01 13:07:41 -0700
committerBrian Behlendorf <[email protected]>2011-11-03 10:15:39 -0700
commit6a95d0b74c2951f0dc82361ea279f64a7349f060 (patch)
tree1401df8a79823003f52821d83ac274c5365864e9 /module/zfs/refcount.c
parenta7b125e9a577cbf66ddbd7cf9701028ff150ee8e (diff)
Fix NULL deref in balance_pgdat()
Be careful not to unconditionally clear the PF_MEMALLOC bit in the task structure. It may have already been set when entering zpl_putpage() in which case it must remain set on exit. In particular the kswapd thread will have PF_MEMALLOC set in order to prevent it from entering direct reclaim. By clearing it we allow the following NULL deref to potentially occur. BUG: unable to handle kernel NULL pointer dereference at (null) IP: [<ffffffff8109c7ab>] balance_pgdat+0x25b/0x4ff Signed-off-by: Brian Behlendorf <[email protected]> Issue #287
Diffstat (limited to 'module/zfs/refcount.c')
0 files changed, 0 insertions, 0 deletions