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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 | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/block/blk-settings.c b/block/blk-settings.c index a000daafbfb4..761c6ccf5af7 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -181,6 +181,7 @@ static void blk_atomic_writes_update_limits(struct queu= e_limits *lim) static void blk_validate_atomic_write_limits(struct queue_limits *lim) { unsigned int boundary_sectors; + unsigned long chunk_bytes; =20 if (!(lim->features & BLK_FEAT_ATOMIC_WRITES)) goto unsupported; @@ -202,6 +203,13 @@ static void blk_validate_atomic_write_limits(struct qu= eue_limits *lim) lim->atomic_write_hw_max)) goto unsupported; =20 + chunk_bytes =3D lim->chunk_sectors << SECTOR_SHIFT; + if (chunk_bytes) { + if (WARN_ON_ONCE(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