Re: [PATCH] dm-inlinecrypt: Fix signedness bug
Mikulas Patocka <[email protected]>
| Newsgroups | dev.linux.lists.dm-devel,org.kernel.vger.linux-kernel |
|---|---|
| Message-ID | <[email protected]> |
Hi
Thanks. I merged this into the existing commit.
Mikulas
On Thu, 7 May 2026, Ethan Tidmore wrote:
> The function get_key_size() returns negative error codes and
> ctx->key_size is an unsigned integer, so the check (ctx->key_size < 0)
> is always impossible
>
> Assign get_key_size() return value to err, check for error code, then
> assign ctx->key_size to err.
>
> Detected by Smatch:
> drivers/md/dm-inlinecrypt.c:329 inlinecrypt_ctr()
> warn: unsigned 'ctx->key_size' is never less than zero.
>
> Fixes: 753450f716417 ("dm-inlinecrypt: add target for inline block device encryption")
> Signed-off-by: Ethan Tidmore <[email protected]>
> ---
> drivers/md/dm-inlinecrypt.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/md/dm-inlinecrypt.c b/drivers/md/dm-inlinecrypt.c
> index 6f804f5a4be6..40d48ba73e23 100644
> --- a/drivers/md/dm-inlinecrypt.c
> +++ b/drivers/md/dm-inlinecrypt.c
> @@ -325,11 +325,13 @@ static int inlinecrypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
> }
>
> /* <key> */
> - ctx->key_size = get_key_size(&argv[1]);
> - if (ctx->key_size < 0) {
> + err = get_key_size(&argv[1]);
> + if (err < 0) {
> ti->error = "Cannot parse key size";
> return -EINVAL;
> }
> + ctx->key_size = err;
> +
> err = inlinecrypt_get_key(argv[1], raw_key, ctx->key_size);
> if (err) {
> ti->error = "Malformed key string";
> --
> 2.54.0
>