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authorDavid Teigland <teigland@redhat.com>2009-06-18 13:20:24 -0500
committerDavid Teigland <teigland@redhat.com>2009-06-18 13:42:42 -0500
commitc78a87d0a1fc885dfdbe21fd5e07787691dfb068 (patch)
tree73f6056f87cd9183e04f3b9f6a4245876cf0cb23 /fs/dlm/lowcomms.c
parenta566a6b11c86147fe9fc9db7ab15f9eecca3e862 (diff)
dlm: fix plock use-after-free
Fix a regression from the original addition of nfs lock support 586759f03e2e9031ac5589912a51a909ed53c30a. When a synchronous (non-nfs) plock completes, the waiting thread will wake up and free the op struct. This races with the user thread in dev_write() which goes on to read the op's callback field to check if the lock is async and needs a callback. This check can happen on the freed op. The fix is to note the callback value before the op can be freed. Signed-off-by: David Teigland <teigland@redhat.com>
Diffstat (limited to 'fs/dlm/lowcomms.c')
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