Commit 5cf41549 authored by Pan Bian's avatar Pan Bian Committed by Greg Kroah-Hartman

hfs: do not free node before using

[ Upstream commit ce96a407adef126870b3f4a1b73529dd8aa80f49 ]

hfs_bmap_free() frees the node via hfs_bnode_put(node).  However, it
then reads node->this when dumping error message on an error path, which
may result in a use-after-free bug.  This patch frees the node only when
it is never again used.

Fixes: a1185ffa2fc ("HFS rewrite")
Signed-off-by: 's avatarPan Bian <>
Reviewed-by: 's avatarAndrew Morton <>
Cc: Joe Perches <>
Cc: Ernesto A. Fernandez <>
Cc: Viacheslav Dubeyko <>
Signed-off-by: 's avatarAndrew Morton <>
Signed-off-by: 's avatarLinus Torvalds <>
Signed-off-by: 's avatarSasha Levin <>
parent 12daef1d
......@@ -328,13 +328,14 @@ void hfs_bmap_free(struct hfs_bnode *node)
nidx -= len * 8;
i = node->next;
if (!i) {
/* panic */;
pr_crit("unable to free bnode %u. bmap not found!\n",
node = hfs_bnode_find(tree, i);
if (IS_ERR(node))
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