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blkdev: Annotate struct request_queue with __counted_by_ptr#577

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blkdev: Annotate struct request_queue with __counted_by_ptr#577
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@blktests-ci blktests-ci bot commented Feb 19, 2026

Pull request for series with
subject: blkdev: Annotate struct request_queue with __counted_by_ptr
version: 1
url: https://patchwork.kernel.org/project/linux-block/list/?series=1055392

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Upstream branch: 2961f84
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Upstream branch: 32a92f8
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Upstream branch: 6de23f8
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Upstream branch: 7dff99b
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Upstream branch: 7dff99b
series: https://patchwork.kernel.org/project/linux-block/list/?series=1058006
version: 2

@blktests-ci blktests-ci bot added V2 and removed V1 V1-ci-pass labels Feb 25, 2026
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blktests-ci bot commented Mar 11, 2026

Upstream branch: None
series: https://patchwork.kernel.org/project/linux-block/list/?series=1058006
version: 2

@bwendling @kawasaki
blkdev: Annotate struct request_queue with __counted_by_ptr
e98cb30 
The queue_hw_ctx field in struct request_queue is an array of pointers to
struct blk_mq_hw_ctx. The number of elements in this array is tracked by
the nr_hw_queues field.

The array is allocated in __blk_mq_realloc_hw_ctxs() using kcalloc_node()
with set->nr_hw_queues elements. q->nr_hw_queues is subsequently updated
to set->nr_hw_queues.

When growing the array, the new array is assigned to queue_hw_ctx before
nr_hw_queues is updated. This is safe because nr_hw_queues (the old
smaller count) is used for bounds checking, which is within the new
larger allocation.

When shrinking the array, nr_hw_queues is updated to the smaller value,
while queue_hw_ctx retains the larger allocation. This is also safe as
the count is within the allocation bounds.

Annotating queue_hw_ctx with __counted_by_ptr(nr_hw_queues) allows the
compiler (with kSAN) to verify that accesses to queue_hw_ctx are within
the valid range defined by nr_hw_queues.

This patch was generated by CodeMender and reviewed by Bill Wendling.
Tested by running blktests.

Reviewed-by: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Bill Wendling <morbo@google.com>
@blktests-ci blktests-ci bot force-pushed the series/1055392=>linus-master branch from 96d69e7 to e98cb30 Compare March 11, 2026 08:16
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