diff options
author | Pan Bian <bianpan2016@163.com> | 2018-11-30 14:09:14 -0800 |
---|---|---|
committer | Ben Hutchings <ben@decadent.org.uk> | 2019-02-11 17:54:16 +0000 |
commit | 32a57e8f4190d67e9d9f847971b3c237f4b78193 (patch) | |
tree | 70c5c1cd5638a17b9342328fd815ec4ebd2a7389 /fs | |
parent | c726f23f2a542064b573d559d217da7e213b04b5 (diff) |
hfs: do not free node before using
commit ce96a407adef126870b3f4a1b73529dd8aa80f49 upstream.
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.
Link: http://lkml.kernel.org/r/1542963889-128825-1-git-send-email-bianpan2016@163.com
Fixes: a1185ffa2fc ("HFS rewrite")
Signed-off-by: Pan Bian <bianpan2016@163.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Joe Perches <joe@perches.com>
Cc: Ernesto A. Fernandez <ernesto.mnd.fernandez@gmail.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>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/hfs/btree.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/hfs/btree.c b/fs/hfs/btree.c index 1ab19e660e69..1ff5774a5382 100644 --- a/fs/hfs/btree.c +++ b/fs/hfs/btree.c @@ -328,13 +328,14 @@ 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; |