From 36e1e5ba90fb3fba6888fae26e4dfc28bf70aaf1 Mon Sep 17 00:00:00 2001 From: Dai Ngo Date: Thu, 29 Oct 2020 15:07:15 -0400 Subject: [PATCH] NFSD: Fix use-after-free warning when doing inter-server copy The source file nfsd_file is not constructed the same as other nfsd_file's via nfsd_file_alloc. nfsd_file_put should not be called to free the object; nfsd_file_put is not the inverse of kzalloc, instead kfree is called by nfsd4_do_async_copy when done. Fixes: ce0887ac96d3 ("NFSD add nfs4 inter ssc to nfsd4_copy") Signed-off-by: Dai Ngo Signed-off-by: J. Bruce Fields --- fs/nfsd/nfs4proc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c index ad2fa1a..9c43cad 100644 --- a/fs/nfsd/nfs4proc.c +++ b/fs/nfsd/nfs4proc.c @@ -1299,7 +1299,7 @@ nfsd4_cleanup_inter_ssc(struct vfsmount *ss_mnt, struct nfsd_file *src, struct nfsd_file *dst) { nfs42_ssc_close(src->nf_file); - nfsd_file_put(src); + /* 'src' is freed by nfsd4_do_async_copy */ nfsd_file_put(dst); mntput(ss_mnt); } -- 2.7.4