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jffs2: free jffs2_sb_info through jffs2_kill_sb()
commit92e2921f7e
upstream. When an invalid mount option is passed to jffs2, jffs2_parse_options() will fail and jffs2_sb_info will be freed, but then jffs2_sb_info will be used (use-after-free) and freeed (double-free) in jffs2_kill_sb(). Fix it by removing the buggy invocation of kfree() when getting invalid mount options. Fixes:92abc475d8
("jffs2: implement mount option parsing and compression overriding") Cc: stable@kernel.org Signed-off-by: Hou Tao <houtao1@huawei.com> Reviewed-by: Richard Weinberger <richard@nod.at> Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 1 additions and 3 deletions
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@ -285,10 +285,8 @@ static int jffs2_fill_super(struct super_block *sb, void *data, int silent)
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sb->s_fs_info = c;
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sb->s_fs_info = c;
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ret = jffs2_parse_options(c, data);
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ret = jffs2_parse_options(c, data);
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if (ret) {
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if (ret)
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kfree(c);
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return -EINVAL;
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return -EINVAL;
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}
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/* Initialize JFFS2 superblock locks, the further initialization will
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/* Initialize JFFS2 superblock locks, the further initialization will
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* be done later */
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* be done later */
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