[PATCH 3/4] nvme-pci: return error when parsing a quirk string fails

[PATCH 3/4] nvme-pci: return error when parsing a quirk string fails

[Guixin Liu]

quirks_param_set() reuses 'err', which param_set_copystring() left as 0,
as the return value of the whole function. When nvme_parse_quirk_entry()
fails to parse a field, the code jumps to out_free_qlist and returns that
stale 0, so a malformed quirks= parameter is silently accepted as valid.

Set err to -EINVAL before jumping out on a parse failure.

Fixes: 7bb8c40f5ad8 ("nvme: add support for dynamic quirk configuration via module parameter")
Signed-off-by: Guixin Liu <kanie@linux.alibaba.com>
---
 drivers/nvme/host/pci.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 69932d640b53..560560268c05 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -213,6 +213,7 @@ static int quirks_param_set(const char *value, const struct kernel_param *kp)
 		if (nvme_parse_quirk_entry(field, &qlist[i])) {
 			pr_err("nvme: failed to parse quirk string %s\n",
 				value);
+			err = -EINVAL;
 			goto out_free_qlist;
 		}
 
-- 
2.43.7

Re: [PATCH 3/4] nvme-pci: return error when parsing a quirk string fails

[Christoph Hellwig]

On Wed, Jul 29, 2026 at 06:59:58PM +0800, Guixin Liu wrote:
> quirks_param_set() reuses 'err', which param_set_copystring() left as 0,
> as the return value of the whole function. When nvme_parse_quirk_entry()
> fails to parse a field, the code jumps to out_free_qlist and returns that
> stale 0, so a malformed quirks= parameter is silently accepted as valid.
> 
> Set err to -EINVAL before jumping out on a parse failure.

Looks good:

Reviewed-by: Christoph Hellwig <hch@lst.de>