ext4: fix stack memory corruption with 64k block size
commit 30a9d7afe70ed6bd9191d3000e2ef1a34fb58493 upstream.
The number of 'counters' elements needed in 'struct sg' is
super_block->s_blocksize_bits + 2. Presently we have 16 'counters'
elements in the array. This is insufficient for block sizes >= 32k. In
such cases the memcpy operation performed in ext4_mb_seq_groups_show()
would cause stack memory corruption.
Signed-off-by: Chandan Rajendra <email@example.com>
Signed-off-by: Theodore Ts'o <firstname.lastname@example.org>
Reviewed-by: Jan Kara <email@example.com>
Signed-off-by: Greg Kroah-Hartman <firstname.lastname@example.org>
1 file changed