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NFS: Fix a tracepoint NULL-pointer dereference 

Running xfstest generic/013 with the tracepoint nfs:nfs4_open_file
enabled produces a NULL-pointer dereference when calculating fileid and
filehandle of the opened file.  Fix this by checking if state is NULL
before trying to use the inode pointer.

Reported-by: Olga Kornievskaia <aglo@umich.edu>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Anna Schumaker 2015-10-05 16:43:26 -04:00 committed by Trond Myklebust
parent 8dbb09570d
commit 39d0d3bdf7
1 changed files with 1 additions and 1 deletions
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2
fs/nfs/nfs4trace.h
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@ -409,7 +409,7 @@ DECLARE_EVENT_CLASS(nfs4_open_event,
__entry->flags = flags;
__entry->fmode = (__force unsigned int)ctx->mode;
__entry->dev = ctx->dentry->d_sb->s_dev;
if (!IS_ERR(state))
if (!IS_ERR_OR_NULL(state))
inode = state->inode;
if (inode != NULL) {
__entry->fileid = NFS_FILEID(inode);