* [PATCH] misc: pci_endpoint_test: Use -EINVAL for small subrange size
@ 2026-03-20 14:01 Koichiro Den
2026-03-20 14:03 ` Niklas Cassel
0 siblings, 1 reply; 2+ messages in thread
From: Koichiro Den @ 2026-03-20 14:01 UTC (permalink / raw)
To: Manivannan Sadhasivam, Krzysztof Wilczyński,
Kishon Vijay Abraham I, Niklas Cassel, Christian Bruel,
Arnd Bergmann, Greg Kroah-Hartman
Cc: linux-pci, linux-kernel
The sub_size check ensures that each subrange is large enough for 32-bit
accesses. Subranges smaller than sizeof(u32) do not satisfy this
assumption, so this is a local sanity check rather than a resource
exhaustion case.
Return -EINVAL instead of -ENOSPC for this case.
Suggested-by: Niklas Cassel <cassel@kernel.org>
Signed-off-by: Koichiro Den <den@valinux.co.jp>
---
drivers/misc/pci_endpoint_test.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
index 55e128ed82f0..496c8f509590 100644
--- a/drivers/misc/pci_endpoint_test.c
+++ b/drivers/misc/pci_endpoint_test.c
@@ -543,15 +543,15 @@ static int pci_endpoint_test_bar_subrange(struct pci_endpoint_test *test,
if (bar_size % nsub || bar_size / nsub > SIZE_MAX) {
ret = -EINVAL;
goto out_clear;
}
sub_size = bar_size / nsub;
if (sub_size < sizeof(u32)) {
- ret = -ENOSPC;
+ ret = -EINVAL;
goto out_clear;
}
/* Limit the temporary buffer size */
buf_size = min_t(size_t, sub_size, SZ_1M);
read_buf = kmalloc(buf_size, GFP_KERNEL);
--
2.51.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] misc: pci_endpoint_test: Use -EINVAL for small subrange size
2026-03-20 14:01 [PATCH] misc: pci_endpoint_test: Use -EINVAL for small subrange size Koichiro Den
@ 2026-03-20 14:03 ` Niklas Cassel
0 siblings, 0 replies; 2+ messages in thread
From: Niklas Cassel @ 2026-03-20 14:03 UTC (permalink / raw)
To: Koichiro Den
Cc: Manivannan Sadhasivam, Krzysztof Wilczyński,
Kishon Vijay Abraham I, Christian Bruel, Arnd Bergmann,
Greg Kroah-Hartman, linux-pci, linux-kernel
On Fri, Mar 20, 2026 at 11:01:39PM +0900, Koichiro Den wrote:
> The sub_size check ensures that each subrange is large enough for 32-bit
> accesses. Subranges smaller than sizeof(u32) do not satisfy this
> assumption, so this is a local sanity check rather than a resource
> exhaustion case.
>
> Return -EINVAL instead of -ENOSPC for this case.
>
> Suggested-by: Niklas Cassel <cassel@kernel.org>
> Signed-off-by: Koichiro Den <den@valinux.co.jp>
Reviewed-by: Niklas Cassel <cassel@kernel.org>
^ permalink raw reply [flat|nested] 2+ messages in thread
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