btrfs: fix int32 overflow in shrink_delalloc().

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UBSAN: Undefined behaviour in fs/btrfs/extent-tree.c:4623:21
signed integer overflow:
10808 * 262144 cannot be represented in type 'int [8]'

If 8192<=items<16384, we request a writeback of an insane number of pages
which is benign (everything will be written).  But if items>=16384, the
space reservation won't be enough.

Signed-off-by: Adam Borowski <kilobyte@angband.pl>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Adam Borowski 2016-05-08 15:08:00 +02:00 • committed by David Sterba

parent 2f3165ecf1

commit 8eb0dfdbda

1 changed files with 1 additions and 1 deletions

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fs/btrfs/extent-tree.c

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