tree 4ba5d1094292e2456e5299ad42674b7f56cfac83
parent d11cf8cc80d946dfc9a23597cd9a0bb1c487cfa7
author Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> 1317379151 +0100
committer Anthony Liguori <aliguori@us.ibm.com> 1317829951 -0500

qed: fix use-after-free during l2 cache commit

QED's metadata caching strategy allows two parallel requests to race for
metadata lookup.  The first one to complete will populate the metadata
cache and the second one will drop the data it just read in favor of the
cached data.

There is a use-after-free in qed_read_l2_table_cb() and
qed_commit_l2_update() where l2_table->offset was used after the
l2_table may have been freed due to a metadata lookup race.  Fix this by
keeping the l2_offset in a local variable and not reaching into the
possibly freed l2_table.

Reported-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>