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dm snapshot: properly fix a crash when an origin has no snapshots
commit 7e768532b2
upstream.
If an origin target has no snapshots, o->split_boundary is set to 0.
This causes BUG_ON(sectors <= 0) in block/bio.c:bio_split().
Fix this by initializing chunk_size, and in turn split_boundary, to
rounddown_pow_of_two(UINT_MAX) -- the largest power of two that fits
into "unsigned" type.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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parent
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commit
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1 changed files with 1 additions and 1 deletions
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@ -854,7 +854,7 @@ static int dm_add_exception(void *context, chunk_t old, chunk_t new)
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static uint32_t __minimum_chunk_size(struct origin *o)
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{
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struct dm_snapshot *snap;
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unsigned chunk_size = 0;
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unsigned chunk_size = rounddown_pow_of_two(UINT_MAX);
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if (o)
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list_for_each_entry(snap, &o->snapshots, list)
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