Replace the manual string copying and parsing logic with a call to
simple_strtoull() to simplify and improve qat_uclo_parse_num().

Ensure that the parsed number does not exceed UINT_MAX, and add an
approximate upper-bound check (no more than 19 digits) to guard against
overflow.

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
---
Changes in v2:
- Use simple_strtoull(), return -EINVAL, and guard against overflow as
  suggested by Andy
- Link to v1: https://lore.kernel.org/lkml/20251022123622.349544-1-thorsten.blum@linux.dev/
---
 drivers/crypto/intel/qat/qat_common/qat_uclo.c | 18 +++++-------------
 1 file changed, 5 insertions(+), 13 deletions(-)

diff --git a/drivers/crypto/intel/qat/qat_common/qat_uclo.c b/drivers/crypto/intel/qat/qat_common/qat_uclo.c
index 18c3e4416dc5..06d49cb781ae 100644
--- a/drivers/crypto/intel/qat/qat_common/qat_uclo.c
+++ b/drivers/crypto/intel/qat/qat_common/qat_uclo.c
@@ -200,20 +200,12 @@ qat_uclo_cleanup_batch_init_list(struct icp_qat_fw_loader_handle *handle,
 
 static int qat_uclo_parse_num(char *str, unsigned int *num)
 {
-	char buf[16] = {0};
-	unsigned long ae = 0;
-	int i;
-
-	strscpy(buf, str, sizeof(buf));
-	for (i = 0; i < 16; i++) {
-		if (!isdigit(buf[i])) {
-			buf[i] = '\0';
-			break;
-		}
-	}
-	if ((kstrtoul(buf, 10, &ae)))
-		return -EFAULT;
+	unsigned long long ae;
+	char *end;
 
+	ae = simple_strtoull(str, &end, 10);
+	if (ae > UINT_MAX || str == end || (end - str) > 19)
+		return -EINVAL;
 	*num = (unsigned int)ae;
 	return 0;
 }
-- 
2.51.0

On Sun, Oct 26, 2025 at 02:57:07AM +0100, Thorsten Blum wrote:
> Replace the manual string copying and parsing logic with a call to
> simple_strtoull() to simplify and improve qat_uclo_parse_num().
> 
> Ensure that the parsed number does not exceed UINT_MAX, and add an
> approximate upper-bound check (no more than 19 digits) to guard against
> overflow.
> 
> Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
> ---
> Changes in v2:
> - Use simple_strtoull(), return -EINVAL, and guard against overflow as
>   suggested by Andy
> - Link to v1: https://lore.kernel.org/lkml/20251022123622.349544-1-thorsten.blum@linux.dev/
> ---
>  drivers/crypto/intel/qat/qat_common/qat_uclo.c | 18 +++++-------------
>  1 file changed, 5 insertions(+), 13 deletions(-)

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

On Sun, Oct 26, 2025 at 02:57:07AM +0100, Thorsten Blum wrote:
> Replace the manual string copying and parsing logic with a call to
> simple_strtoull() to simplify and improve qat_uclo_parse_num().
> 
> Ensure that the parsed number does not exceed UINT_MAX, and add an
> approximate upper-bound check (no more than 19 digits) to guard against
> overflow.

Reviewed-by; Andy Shevchenko <andriy.shevchenko@linux.intel.com>

> ---
> Changes in v2:
> - Use simple_strtoull(), return -EINVAL, and guard against overflow as
>   suggested by Andy

(some) overflows :-) But at least it keeps the code on par with the original.

And we ignore false positive (in this case!) checkpatch warning.

-- 
With Best Regards,
Andy Shevchenko

On Mon, Oct 27, 2025 at 11:02:16AM +0200, Andy Shevchenko wrote:
> On Sun, Oct 26, 2025 at 02:57:07AM +0100, Thorsten Blum wrote:
> > Replace the manual string copying and parsing logic with a call to
> > simple_strtoull() to simplify and improve qat_uclo_parse_num().
> > 
> > Ensure that the parsed number does not exceed UINT_MAX, and add an
> > approximate upper-bound check (no more than 19 digits) to guard against
> > overflow.
> 
> Reviewed-by; Andy Shevchenko <andriy.shevchenko@linux.intel.com>
s/;/:

I just noticed this while applying the patch to my local tree.

Due to the typo, patchwork is not applying your tag [1].

[1] https://patchwork.kernel.org/project/linux-crypto/patch/20251026015710.1368-1-thorsten.blum@linux.dev/mbox/

Regards,

-- 
Giovanni

On Thu, Oct 30, 2025 at 11:27:37AM +0000, Giovanni Cabiddu wrote:
> On Mon, Oct 27, 2025 at 11:02:16AM +0200, Andy Shevchenko wrote:
> > On Sun, Oct 26, 2025 at 02:57:07AM +0100, Thorsten Blum wrote:
> > > Replace the manual string copying and parsing logic with a call to
> > > simple_strtoull() to simplify and improve qat_uclo_parse_num().
> > > 
> > > Ensure that the parsed number does not exceed UINT_MAX, and add an
> > > approximate upper-bound check (no more than 19 digits) to guard against
> > > overflow.
> > 
> > Reviewed-by; Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> s/;/:
> 
> I just noticed this while applying the patch to my local tree.
> 
> Due to the typo, patchwork is not applying your tag [1].

Oh, thanks for catching this. Have you added it manually or should I do
something about it?

> [1] https://patchwork.kernel.org/project/linux-crypto/patch/20251026015710.1368-1-thorsten.blum@linux.dev/mbox/

-- 
With Best Regards,
Andy Shevchenko

On Thu, Oct 30, 2025 at 04:03:10PM +0200, Andy Shevchenko wrote:
> On Thu, Oct 30, 2025 at 11:27:37AM +0000, Giovanni Cabiddu wrote:
> > On Mon, Oct 27, 2025 at 11:02:16AM +0200, Andy Shevchenko wrote:
> > > On Sun, Oct 26, 2025 at 02:57:07AM +0100, Thorsten Blum wrote:
> > > > Replace the manual string copying and parsing logic with a call to
> > > > simple_strtoull() to simplify and improve qat_uclo_parse_num().
> > > > 
> > > > Ensure that the parsed number does not exceed UINT_MAX, and add an
> > > > approximate upper-bound check (no more than 19 digits) to guard against
> > > > overflow.
> > > 
> > > Reviewed-by; Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> > s/;/:
> > 
> > I just noticed this while applying the patch to my local tree.
> > 
> > Due to the typo, patchwork is not applying your tag [1].
> 
> Oh, thanks for catching this. Have you added it manually or should I do
> something about it?
I haven't added it manually. If you reply with your tag again it will
get sorted.

Thanks!

-- 
Giovanni

On Thu, Oct 30, 2025 at 02:10:15PM +0000, Giovanni Cabiddu wrote:
> On Thu, Oct 30, 2025 at 04:03:10PM +0200, Andy Shevchenko wrote:
> > On Thu, Oct 30, 2025 at 11:27:37AM +0000, Giovanni Cabiddu wrote:
> > > On Mon, Oct 27, 2025 at 11:02:16AM +0200, Andy Shevchenko wrote:
> > > > On Sun, Oct 26, 2025 at 02:57:07AM +0100, Thorsten Blum wrote:
> > > > > Replace the manual string copying and parsing logic with a call to
> > > > > simple_strtoull() to simplify and improve qat_uclo_parse_num().
> > > > > 
> > > > > Ensure that the parsed number does not exceed UINT_MAX, and add an
> > > > > approximate upper-bound check (no more than 19 digits) to guard against
> > > > > overflow.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

> > > I just noticed this while applying the patch to my local tree.
> > > 
> > > Due to the typo, patchwork is not applying your tag [1].
> > 
> > Oh, thanks for catching this. Have you added it manually or should I do
> > something about it?
> I haven't added it manually. If you reply with your tag again it will
> get sorted.

-- 
With Best Regards,
Andy Shevchenko

On Sun, Oct 26, 2025 at 02:57:07AM +0100, Thorsten Blum wrote:
> Replace the manual string copying and parsing logic with a call to
> simple_strtoull() to simplify and improve qat_uclo_parse_num().
> 
> Ensure that the parsed number does not exceed UINT_MAX, and add an
> approximate upper-bound check (no more than 19 digits) to guard against
> overflow.
> 
> Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Acked-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>

Thanks,

-- 
Giovanni