Avoid double-copying of string literals. Use a "const char *" for each string instead of copying from .rodata into stack and then into the skb. We can go directly from .rodata to the skb.
This also works around a Clang bug (that has since been fixed[1]). Reported-by: kernel test robot <l...@intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202401250927.1pozerd6-...@intel.com/ Fixes: ab4e4380d4e1 ("Bluetooth: Add vhci devcoredump support") Link: https://github.com/llvm/llvm-project/commit/ea2e66aa8b6e363b89df66dc44275a0d7ecd70ce [1] Cc: sta...@vger.kernel.org Signed-off-by: Kees Cook <k...@kernel.org> --- Cc: Marcel Holtmann <mar...@holtmann.org> Cc: Luiz Augusto von Dentz <luiz.de...@gmail.com> Cc: Josh Poimboeuf <jpoim...@kernel.org> Cc: Nathan Chancellor <nat...@kernel.org> Cc: Peter Zijlstra <pet...@infradead.org> Cc: linux-blueto...@vger.kernel.org --- drivers/bluetooth/hci_vhci.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/bluetooth/hci_vhci.c b/drivers/bluetooth/hci_vhci.c index 7651321d351c..9ac22e4a070b 100644 --- a/drivers/bluetooth/hci_vhci.c +++ b/drivers/bluetooth/hci_vhci.c @@ -289,18 +289,18 @@ static void vhci_coredump(struct hci_dev *hdev) static void vhci_coredump_hdr(struct hci_dev *hdev, struct sk_buff *skb) { - char buf[80]; + const char *buf; - snprintf(buf, sizeof(buf), "Controller Name: vhci_ctrl\n"); + buf = "Controller Name: vhci_ctrl\n"; skb_put_data(skb, buf, strlen(buf)); - snprintf(buf, sizeof(buf), "Firmware Version: vhci_fw\n"); + buf = "Firmware Version: vhci_fw\n"; skb_put_data(skb, buf, strlen(buf)); - snprintf(buf, sizeof(buf), "Driver: vhci_drv\n"); + buf = "Driver: vhci_drv\n"; skb_put_data(skb, buf, strlen(buf)); - snprintf(buf, sizeof(buf), "Vendor: vhci\n"); + buf = "Vendor: vhci\n"; skb_put_data(skb, buf, strlen(buf)); } -- 2.34.1
