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| author | Jens Axboe <axboe@kernel.dk> | 2023-03-29 00:10:31 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2023-03-29 17:55:18 +0300 |
| commit | 0a2481cde24f78f503cbc066df2c9c160e64cfd6 (patch) | |
| tree | 2d9ab0a38d3580220639c5677ae7f690dc6afe3b | |
| parent | 3a93e40326c8f470e71d20b4c42d36767450f38f (diff) | |
| download | linux-0a2481cde24f78f503cbc066df2c9c160e64cfd6.tar.xz | |
block: ensure bio_alloc_map_data() deals with ITER_UBUF correctly
This helper blindly copies the iovec, even if we don't have one.
Make this case a bit smarter by only doing so if we have an iovec
array to copy.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | block/blk-map.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/block/blk-map.c b/block/blk-map.c index 9137d16cecdc..3bfcad64d67c 100644 --- a/block/blk-map.c +++ b/block/blk-map.c @@ -29,10 +29,11 @@ static struct bio_map_data *bio_alloc_map_data(struct iov_iter *data, bmd = kmalloc(struct_size(bmd, iov, data->nr_segs), gfp_mask); if (!bmd) return NULL; - memcpy(bmd->iov, data->iov, sizeof(struct iovec) * data->nr_segs); bmd->iter = *data; - if (iter_is_iovec(data)) + if (iter_is_iovec(data)) { + memcpy(bmd->iov, data->iov, sizeof(struct iovec) * data->nr_segs); bmd->iter.iov = bmd->iov; + } return bmd; } |