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NFS: nfs_igrab_and_active must first reference the superblock

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commit 896567ee7f17a8a736cda8a28cc987228410a2ac upstream.

Before referencing the inode, we must ensure that the superblock can be
referenced. Otherwise, we can end up with iput() calling superblock
operations that are no longer valid or accessible.

Fixes: ea7c38fef0 ("NFSv4: Ensure we reference the inode for return-on-close in delegreturn")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Trond Myklebust 2021-01-10 15:58:08 -05:00 committed by Greg Kroah-Hartman
parent b4689562fa
commit 51121ea1d1
1 changed files with 7 additions and 5 deletions
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12
fs/nfs/internal.h
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@ -605,12 +605,14 @@ extern void nfs4_test_session_trunk(struct rpc_clnt *clnt,
static inline struct inode *nfs_igrab_and_active(struct inode *inode)
{
inode = igrab(inode);
if (inode != NULL && !nfs_sb_active(inode->i_sb)) {
iput(inode);
inode = NULL;
struct super_block *sb = inode->i_sb;
if (sb && nfs_sb_active(sb)) {
if (igrab(inode))
return inode;
nfs_sb_deactive(sb);
}
return inode;
return NULL;
}
static inline void nfs_iput_and_deactive(struct inode *inode)