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NFSv4: Fix an Oops in nfs4_do_setattr 

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: 29b59f9416 ("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+
This commit is contained in:
Trond Myklebust 2019-08-03 10:28:18 -04:00
parent c77e22834a
commit 09a54f0ebf
1 changed files with 1 additions and 1 deletions
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fs/nfs/nfs4proc.c
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@ -3214,7 +3214,7 @@ static int _nfs4_do_setattr(struct inode *inode,
if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) { if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) {
/* Use that stateid */ /* Use that stateid */
} else if (ctx != NULL) { } else if (ctx != NULL && ctx->state) {
struct nfs_lock_context *l_ctx; struct nfs_lock_context *l_ctx;
if (!nfs4_valid_open_stateid(ctx->state)) if (!nfs4_valid_open_stateid(ctx->state))
return -EBADF; return -EBADF;