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dm ioctl: use struct_size() helper in retrieve_deps()

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One of the more common cases of allocation size calculations is finding
the size of a structure that has a zero-sized array at the end, along
with memory for some number of elements for that array. For example:

struct dm_target_deps {
      ...
        __u64 dev[0];   /* out */
};

Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes.

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Gustavo A. R. Silva 2020-06-17 12:31:45 -04:00 committed by Mike Snitzer
parent a143e172b6
commit da8996250a
1 changed files with 1 additions and 1 deletions
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2
drivers/md/dm-ioctl.c
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@ -1471,7 +1471,7 @@ static void retrieve_deps(struct dm_table *table,
/*
* Check we have enough space.
*/
needed = sizeof(*deps) + (sizeof(*deps->dev) * count);
needed = struct_size(deps, dev, count);
if (len < needed) {
param->flags |= DM_BUFFER_FULL_FLAG;
return;