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* [PATCH] NFSv4: Fix an Oops in nfs4_do_setattr
@ 2019-08-03 14:43 Trond Myklebust
  2019-08-05 16:38 ` Olga Kornievskaia
  0 siblings, 1 reply; 2+ messages in thread
From: Trond Myklebust @ 2019-08-03 14:43 UTC (permalink / raw)
  To: Olga Kornievskaia; +Cc: linux-nfs

If the user specifies an open mode of 3, then we don't have a NFSv4 state
attached to the context, and so we Oops when we try to dereference it.

Reported-by: Olga Kornievskaia <aglo@umich.edu>
Fixes: 29b59f9416937 ("NFSv4: change nfs4_do_setattr to take...")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Cc: stable@vger.kernel.org # v4.10: 991eedb1371dc: NFSv4: Only pass the...
Cc: stable@vger.kernel.org # v4.10+
---
 fs/nfs/nfs4proc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 3e0b93f2b61a..12b2b65ad8a8 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -3214,7 +3214,7 @@ static int _nfs4_do_setattr(struct inode *inode,
 
 	if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) {
 		/* Use that stateid */
-	} else if (ctx != NULL) {
+	} else if (ctx != NULL && ctx->state) {
 		struct nfs_lock_context *l_ctx;
 		if (!nfs4_valid_open_stateid(ctx->state))
 			return -EBADF;
-- 
2.21.0


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2019-08-03 14:43 [PATCH] NFSv4: Fix an Oops in nfs4_do_setattr Trond Myklebust
2019-08-05 16:38 ` Olga Kornievskaia

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