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 6f24768..79bd03b 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)