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| author | Chandan Rajendra <chandan@linux.vnet.ibm.com> | 2016-11-15 02:26:26 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-01-06 09:40:13 (GMT) |
| commit | b493c715cdce57c803413e635e19f34f96041430 (patch) | |
| tree | 987fbb5ee3a4d56db15a695dc85773b66dbd1bb8 /fs/ext4/super.c | |
| parent | c3881abae6e7060d17beaa4f2af3190ff0937fd2 (diff) | |
| download | linux-b493c715cdce57c803413e635e19f34f96041430.tar.xz | |
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.
Fixes: c9de560ded61f
Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/ext4/super.c')
0 files changed, 0 insertions, 0 deletions