ext2: fix a block leak (5aa1437d) · Commits · 戴 / test

open file, unlink it, then use ioctl(2) to make it immutable or append only. Now close it and watch the blocks *not* freed... Immutable/append-only checks belong in ->setattr(). Note: the bug is old and backport to anything prior to ("ext2: convert to use the new truncate convention") will need these checks lifted into ext2_setattr(). Cc: stable@kernel.org Signed-off-by:

Al Viro <viro@zeniv.linux.org.uk>

fs/ext2/inode.c

+0 −10

Original line number	Diff line number	Diff line
		@@ -1264,21 +1264,11 @@ do_indirects:

		static void ext2_truncate_blocks(struct inode *inode, loff_t offset)
		{
		/*
		* XXX: it seems like a bug here that we don't allow
		* IS_APPEND inode to have blocks-past-i_size trimmed off.
		* review and fix this.
		*
		* Also would be nice to be able to handle IO errors and such,
		* but that's probably too much to ask.
		*/
		if (!(S_ISREG(inode->i_mode) \|\| S_ISDIR(inode->i_mode) \|\|
		S_ISLNK(inode->i_mode)))
		return;
		if (ext2_inode_is_fast_symlink(inode))
		return;
		if (IS_APPEND(inode) \|\| IS_IMMUTABLE(inode))
		return;

		dax_sem_down_write(EXT2_I(inode));
		__ext2_truncate_blocks(inode, offset);

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