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these values. However it is also improper to have atomic write unit max > chunk_sectors (for non-zero chunk_sectors), as this would lead to splitting of atomic write bios (which is disallowed). Sanitize atomic write unit max against chunk_sectors to avoid any potential problems. Fixes: d00eea91deaf3 ("block: Add extra checks in blk_validate_atomic_write= _limits()") Reviewed-by: Nilay Shroff Signed-off-by: John Garry --- block/blk-settings.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/block/blk-settings.c b/block/blk-settings.c index a000daafbfb48..a2c089167174e 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -180,6 +180,7 @@ static void blk_atomic_writes_update_limits(struct queu= e_limits *lim) =20 static void blk_validate_atomic_write_limits(struct queue_limits *lim) { + unsigned long long chunk_bytes =3D lim->chunk_sectors << SECTOR_SHIFT; unsigned int boundary_sectors; =20 if (!(lim->features & BLK_FEAT_ATOMIC_WRITES)) @@ -202,6 +203,10 @@ static void blk_validate_atomic_write_limits(struct qu= eue_limits *lim) lim->atomic_write_hw_max)) goto unsupported; =20 + if (WARN_ON_ONCE(chunk_bytes && + lim->atomic_write_hw_unit_max > chunk_bytes)) + goto unsupported; + boundary_sectors =3D lim->atomic_write_hw_boundary >> SECTOR_SHIFT; =20 if (boundary_sectors) { --=20 2.43.5