UBIFS: fix oops on error path in read_pnode

commit 54acbaaa523ca0bd284a18f67ad213c379679e86 upstream.

Thanks to coverity which spotted that UBIFS will oops if 'kmalloc()'
in 'read_pnode()' fails and we dereference a NULL 'pnode' pointer
when we 'goto out'.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/fs/ubifs/lpt.c b/fs/ubifs/lpt.c
index 9ff2463177e503f563f6f5cd543c339444d9638e..700a9258192a96aa2be68a3f6550917d6e679e38 100644 (file)
--- a/fs/ubifs/lpt.c
+++ b/fs/ubifs/lpt.c
@@ -1240,10 +1240,9 @@ static int read_pnode(struct ubifs_info *c, struct ubifs_nnode *parent, int iip)
        lnum = branch->lnum;
        offs = branch->offs;
        pnode = kzalloc(sizeof(struct ubifs_pnode), GFP_NOFS);
-       if (!pnode) {
-               err = -ENOMEM;
-               goto out;
-       }
+       if (!pnode)
+               return -ENOMEM;
+
        if (lnum == 0) {
                /*
                 * This pnode was not written which just means that the LEB