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authorPan Bian <bianpan2016@163.com>2018-11-30 14:09:18 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-11-30 14:56:14 -0800
commitc7d7d620dcbd2a1c595092280ca943f2fced7bbd (patch)
tree2b1e9ff0c8d4ffeab24361d21b4d264c3f7264dc
parentce96a407adef126870b3f4a1b73529dd8aa80f49 (diff)
downloadlinux-c7d7d620dcbd2a1c595092280ca943f2fced7bbd.tar.bz2
hfsplus: do not free node before using
hfs_bmap_free() frees 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 node only when it is never used. Link: http://lkml.kernel.org/r/1543053441-66942-1-git-send-email-bianpan2016@163.com Signed-off-by: Pan Bian <bianpan2016@163.com> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Ernesto A. Fernandez <ernesto.mnd.fernandez@gmail.com> Cc: Joe Perches <joe@perches.com> Cc: Viacheslav Dubeyko <slava@dubeyko.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/hfsplus/btree.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/hfsplus/btree.c b/fs/hfsplus/btree.c
index 236efe51eca6..66774f4cb4fd 100644
--- a/fs/hfsplus/btree.c
+++ b/fs/hfsplus/btree.c
@@ -466,14 +466,15 @@ void hfs_bmap_free(struct hfs_bnode *node)
nidx -= len * 8;
i = node->next;
- hfs_bnode_put(node);
if (!i) {
/* panic */;
pr_crit("unable to free bnode %u. "
"bmap not found!\n",
node->this);
+ hfs_bnode_put(node);
return;
}
+ hfs_bnode_put(node);
node = hfs_bnode_find(tree, i);
if (IS_ERR(node))
return;