ext4: fix stack memory corruption with 64k block size

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commit 30a9d7afe7 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: c9de560ded
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: Ben Hutchings <ben@decadent.org.uk>

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Chandan Rajendra 2016-11-14 21:26:26 -05:00 • committed by Ben Hutchings

parent f1c98d6199

commit 7a361d9683

1 changed files with 1 additions and 1 deletions

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fs/ext4/mballoc.c

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