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authorAmir Goldstein <amir73il@gmail.com>2018-07-13 17:22:24 +0300
committerJ. Bruce Fields <bfields@redhat.com>2018-08-09 16:11:21 -0400
commit64bed6cbe38bc95689fb9399872d9ce250192f90 (patch)
tree6376a71e746622c32818abd785c05a09593a01a8 /fs/nfsd
parent8163496e78db100a6b5cfbdaece385686ae50129 (diff)
nfsd: fix leaked file lock with nfs exported overlayfs
nfsd and lockd call vfs_lock_file() to lock/unlock the inode returned by locks_inode(file). Many places in nfsd/lockd code use the inode returned by file_inode(file) for lock manipulation. With Overlayfs, file_inode() (the underlying inode) is not the same object as locks_inode() (the overlay inode). This can result in "Leaked POSIX lock" messages and eventually to a kernel crash as reported by Eddie Horng: https://marc.info/?l=linux-unionfs&m=153086643202072&w=2 Fix all the call sites in nfsd/lockd that should use locks_inode(). This is a correctness bug that manifested when overlayfs gained NFS export support in v4.16. Reported-by: Eddie Horng <eddiehorng.tw@gmail.com> Tested-by: Eddie Horng <eddiehorng.tw@gmail.com> Cc: Jeff Layton <jlayton@kernel.org> Fixes: 8383f1748829 ("ovl: wire up NFS export operations") Cc: stable@vger.kernel.org Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd')
-rw-r--r--fs/nfsd/nfs4state.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 19c4d29917ee..c8e4a8f42bbe 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -6322,7 +6322,7 @@ check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner)
return status;
}
- inode = file_inode(filp);
+ inode = locks_inode(filp);
flctx = inode->i_flctx;
if (flctx && !list_empty_careful(&flctx->flc_posix)) {