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| author | Al Viro <viro@zeniv.linux.org.uk> | 2019-03-26 01:39:50 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-08 07:20:49 +0200 |
| commit | f9c04ee063108bfe16a7232429402866aa0ddd26 (patch) | |
| tree | 32d1b44c0608a78cfbf9a87dbba4b554cc03e28d | |
| parent | 87f74cd974d69fb33ec00dca26f7655eb0569a79 (diff) | |
| download | linux-f9c04ee063108bfe16a7232429402866aa0ddd26.tar.gz linux-f9c04ee063108bfe16a7232429402866aa0ddd26.tar.bz2 linux-f9c04ee063108bfe16a7232429402866aa0ddd26.zip | |
jffs2: fix use-after-free on symlink traversal
[ Upstream commit 4fdcfab5b5537c21891e22e65996d4d0dd8ab4ca ]
free the symlink body after the same RCU delay we have for freeing the
struct inode itself, so that traversal during RCU pathwalk wouldn't step
into freed memory.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | fs/jffs2/readinode.c | 5 | ||||
| -rw-r--r-- | fs/jffs2/super.c | 5 |
2 files changed, 4 insertions, 6 deletions
diff --git a/fs/jffs2/readinode.c b/fs/jffs2/readinode.c index 389ea53ea487..bccfc40b3a74 100644 --- a/fs/jffs2/readinode.c +++ b/fs/jffs2/readinode.c @@ -1414,11 +1414,6 @@ void jffs2_do_clear_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f) jffs2_kill_fragtree(&f->fragtree, deleted?c:NULL); - if (f->target) { - kfree(f->target); - f->target = NULL; - } - fds = f->dents; while(fds) { fd = fds; diff --git a/fs/jffs2/super.c b/fs/jffs2/super.c index 83340496645b..9a9f30eddbbb 100644 --- a/fs/jffs2/super.c +++ b/fs/jffs2/super.c @@ -47,7 +47,10 @@ static struct inode *jffs2_alloc_inode(struct super_block *sb) static void jffs2_i_callback(struct rcu_head *head) { struct inode *inode = container_of(head, struct inode, i_rcu); - kmem_cache_free(jffs2_inode_cachep, JFFS2_INODE_INFO(inode)); + struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); + + kfree(f->target); + kmem_cache_free(jffs2_inode_cachep, f); } static void jffs2_destroy_inode(struct inode *inode) |