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| author | Pan Bian <bianpan2016@163.com> | 2018-11-30 14:09:18 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-12-17 21:55:12 +0100 |
| commit | 168a1537ca6f5058243cc88c025a55ac87f22fd3 (patch) | |
| tree | fc225e5f6662be551c32a1b9098744522913928c /fs | |
| parent | 736ba5cba268c3b2b6abd16947cf42ff5ad96164 (diff) | |
| download | linux-stable-168a1537ca6f5058243cc88c025a55ac87f22fd3.tar.gz linux-stable-168a1537ca6f5058243cc88c025a55ac87f22fd3.tar.bz2 linux-stable-168a1537ca6f5058243cc88c025a55ac87f22fd3.zip | |
hfsplus: do not free node before using
[ Upstream commit c7d7d620dcbd2a1c595092280ca943f2fced7bbd ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/hfsplus/btree.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/hfsplus/btree.c b/fs/hfsplus/btree.c index 3345c7553edc..7adc8a327e03 100644 --- a/fs/hfsplus/btree.c +++ b/fs/hfsplus/btree.c @@ -453,14 +453,15 @@ 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; |