Commit 4596fe07 authored Mar 21, 2011 by Eric Sandeen Committed by Theodore Ts'o Mar 21, 2011

ext4: don't kfree uninitialized s_group_info members

We can call kfree on uninitialized members of the s_group_info array
on an the error path.  We can avoid this by kzalloc'ing the array.

This doesn't entirely solve the oops on mount if we fail down this
path; failed_mount4: frees the sbi, for one, which gets referenced
later in the failed mount paths - I haven't worked that out yet.

https://bugzilla.kernel.org/show_bug.cgi?id=30872



Reported-by: Eugene A. Shatokhin <dame_eugene@mail.ru>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

parent 21149d61

fs/ext4/mballoc.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -2386,7 +2386,7 @@ static int ext4_mb_init_backend(struct super_block *sb)
		/* An 8TB filesystem with 64-bit pointers requires a 4096 byte
		* kmalloc. A 128kb malloc should suffice for a 256TB filesystem.
		* So a two level scheme suffices for now. */
		sbi->s_group_info = kmalloc(array_size, GFP_KERNEL);
		sbi->s_group_info = kzalloc(array_size, GFP_KERNEL);
		if (sbi->s_group_info == NULL) {
		printk(KERN_ERR "EXT4-fs: can't allocate buddy meta group\n");
		return -ENOMEM;