knfsd: avoid use of unitialised variables on error path when nfs exports

We need to zero various parts of 'exp' before any 'goto out', otherwise when
we go to free the contents...  we die.

Signed-off-by: Neil Brown <neilb@suse.de>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index 6f24768272a1f05dcdd9657d3bb22755c06e9dce..79bd03b8bbf868e7638b1e85f90977b7727c88e6 100644 (file)
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -469,6 +469,13 @@ static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
        nd.dentry = NULL;
        exp.ex_path = NULL;
 
+       /* fs locations */
+       exp.ex_fslocs.locations = NULL;
+       exp.ex_fslocs.locations_count = 0;
+       exp.ex_fslocs.migrated = 0;
+
+       exp.ex_uuid = NULL;
+
        if (mesg[mlen-1] != '\n')
                return -EINVAL;
        mesg[mlen-1] = 0;
@@ -509,13 +516,6 @@ static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
        if (exp.h.expiry_time == 0)
                goto out;
 
-       /* fs locations */
-       exp.ex_fslocs.locations = NULL;
-       exp.ex_fslocs.locations_count = 0;
-       exp.ex_fslocs.migrated = 0;
-
-       exp.ex_uuid = NULL;
-
        /* flags */
        err = get_int(&mesg, &an_int);
        if (err == -ENOENT)