forked from luck/tmp_suning_uos_patched
0625c2dd6a
In nfs4_wait_clnt_recover(), hold a reference to the clp being waited on. The state manager can reduce clp->cl_count to 1, in which case the nfs_put_client() in nfs4_run_state_manager() can free *clp before wait_on_bit() returns and allows nfs4_wait_clnt_recover() to run again. The behavior at that point is non-deterministic. If the waited-on bit still happens to be zero, wait_on_bit() will wake the waiter as expected. If the bit is set again (say, if the memory was poisoned when freed) wait_on_bit() can leave the waiter asleep. This is a narrow fix which ensures the safety of accessing *clp in nfs4_wait_clnt_recover(), but does not address the continued use of a possibly freed *clp after nfs4_wait_clnt_recover() returns (see nfs_end_delegation_return(), for example). Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> |
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| .. | ||
| blocklayout | ||
| objlayout | ||
| cache_lib.c | ||
| cache_lib.h | ||
| callback_proc.c | ||
| callback_xdr.c | ||
| callback.c | ||
| callback.h | ||
| client.c | ||
| delegation.c | ||
| delegation.h | ||
| dir.c | ||
| direct.c | ||
| dns_resolve.c | ||
| dns_resolve.h | ||
| file.c | ||
| fscache-index.c | ||
| fscache.c | ||
| fscache.h | ||
| getroot.c | ||
| idmap.c | ||
| inode.c | ||
| internal.h | ||
| iostat.h | ||
| Kconfig | ||
| Makefile | ||
| mount_clnt.c | ||
| namespace.c | ||
| netns.h | ||
| nfs2super.c | ||
| nfs2xdr.c | ||
| nfs3acl.c | ||
| nfs3client.c | ||
| nfs3proc.c | ||
| nfs3super.c | ||
| nfs3xdr.c | ||
| nfs4_fs.h | ||
| nfs4client.c | ||
| nfs4file.c | ||
| nfs4filelayout.c | ||
| nfs4filelayout.h | ||
| nfs4filelayoutdev.c | ||
| nfs4getroot.c | ||
| nfs4namespace.c | ||
| nfs4proc.c | ||
| nfs4renewd.c | ||
| nfs4session.c | ||
| nfs4session.h | ||
| nfs4state.c | ||
| nfs4super.c | ||
| nfs4sysctl.c | ||
| nfs4trace.c | ||
| nfs4trace.h | ||
| nfs4xdr.c | ||
| nfs.h | ||
| nfsroot.c | ||
| nfstrace.c | ||
| nfstrace.h | ||
| pagelist.c | ||
| pnfs_dev.c | ||
| pnfs.c | ||
| pnfs.h | ||
| proc.c | ||
| read.c | ||
| super.c | ||
| symlink.c | ||
| sysctl.c | ||
| unlink.c | ||
| write.c | ||