[PATCH] nvme: fix memory leak in quirks_param_set()

[Maurizio Lombardi]

When loading the nvme module, if the 'quirks' parameter is specified
via both the kernel command line (e.g., nvme.quirks=...) and the
modprobe command line (e.g., modprobe nvme quirks=...), the
quirks_param_set() callback is invoked twice.

Currently, in the double-invocation scenario, the second call
overwrites the nvme_pci_quirk_list pointer, causing the memory
allocated in the first call to leak.

Fix this by freeing the existing list before assigning the new one.

Fixes: b4247c8317c5 ("nvme: add support for dynamic quirk configuration via module parameter")
Signed-off-by: Maurizio Lombardi <mlombard at redhat.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 a6cf0897a0f2..3e1c6adf2cf0 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -219,6 +219,7 @@ static int quirks_param_set(const char *value, const struct kernel_param *kp)
 		i++;
 	}
 
+	kfree(nvme_pci_quirk_list);
 	nvme_pci_quirk_count = count;
 	nvme_pci_quirk_list  = qlist;
 	goto out_free_val;
-- 
2.53.0