Re: [PATCH 02/10] drbd: Remove uninitialized_var() usage
From: Nick Desaulniers <hidden>
Date: 2020-06-04 19:56:29
Also in:
linux-block, linux-clk, linux-ide, linux-mm, linux-spi, linux-wireless, lkml
On Wed, Jun 3, 2020 at 4:32 PM Kees Cook [off-list ref] wrote:
Using uninitialized_var() is dangerous as it papers over real bugs[1] (or can in the future), and suppresses unrelated compiler warnings (e.g. "unused variable"). If the compiler thinks it is uninitialized, either simply initialize the variable or make compiler changes. As a precursor to removing[2] this[3] macro[4], just initialize this variable to NULL. [1] https://lore.kernel.org/lkml/20200603174714.192027-1-glider@google.com/ (local) [2] https://lore.kernel.org/lkml/CA+55aFw+Vbj0i=1TGqCR5vQkCzWJ0QxK6CernOU6eedsudAixw@mail.gmail.com/ (local) [3] https://lore.kernel.org/lkml/CA+55aFwgbgqhbp1fkxvRKEpzyR5J8n1vKT1VZdz9knmPuXhOeg@mail.gmail.com/ (local) [4] https://lore.kernel.org/lkml/CA+55aFz2500WfbKXAx8s67wrm9=yVJu65TpLgN_ybYNv0VEOKA@mail.gmail.com/ (local) Signed-off-by: Kees Cook <redacted>
Reviewed-by: Nick Desaulniers <redacted>
Fixes: a29728463b25 ("drbd: Backport the "events2" command")
quoted hunk ↗ jump to hunk
--- drivers/block/drbd/drbd_state.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)diff --git a/drivers/block/drbd/drbd_state.c b/drivers/block/drbd/drbd_state.c index eeaa3b49b264..0067d328f0b5 100644 --- a/drivers/block/drbd/drbd_state.c +++ b/drivers/block/drbd/drbd_state.c@@ -1604,7 +1604,7 @@ static void broadcast_state_change(struct drbd_state_change *state_change) unsigned int n_device, n_connection, n_peer_device, n_peer_devices; void (*last_func)(struct sk_buff *, unsigned int, void *, enum drbd_notification_type) = NULL; - void *uninitialized_var(last_arg); + void *last_arg = NULL; #define HAS_CHANGED(state) ((state)[OLD] != (state)[NEW]) #define FINAL_STATE_CHANGE(type) \ --2.25.1 -- You received this message because you are subscribed to the Google Groups "Clang Built Linux" group. To unsubscribe from this group and stop receiving emails from it, send an email to clang-built-linux+unsubscribe@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/clang-built-linux/20200603233203.1695403-3-keescook%40chromium.org.
-- Thanks, ~Nick Desaulniers