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From: Jakub Kicinski <kuba@kernel.org>
To: davem@davemloft.net
Cc: netdev@vger.kernel.org, edumazet@google.com, pabeni@redhat.com,
	Jakub Kicinski <kuba@kernel.org>,
	elder@kernel.org
Subject: [PATCH net-next] net: ipa: don't proceed to out-of-bound write
Date: Wed, 18 May 2022 17:44:17 -0700	[thread overview]
Message-ID: <20220519004417.2109886-1-kuba@kernel.org> (raw)

GCC 12 seems upset that we check ipa_irq against array bound
but then proceed, anyway:

drivers/net/ipa/ipa_interrupt.c: In function ‘ipa_interrupt_add’:
drivers/net/ipa/ipa_interrupt.c:196:27: warning: array subscript 30 is above array bounds of ‘void (*[30])(struct ipa *, enum ipa_irq_id)’ [-Warray-bounds]
  196 |         interrupt->handler[ipa_irq] = handler;
      |         ~~~~~~~~~~~~~~~~~~^~~~~~~~~
drivers/net/ipa/ipa_interrupt.c:42:27: note: while referencing ‘handler’
   42 |         ipa_irq_handler_t handler[IPA_IRQ_COUNT];
      |                           ^~~~~~~

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
CC: elder@kernel.org
---
 drivers/net/ipa/ipa_interrupt.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ipa/ipa_interrupt.c b/drivers/net/ipa/ipa_interrupt.c
index b35170a93b0f..307bed2ee707 100644
--- a/drivers/net/ipa/ipa_interrupt.c
+++ b/drivers/net/ipa/ipa_interrupt.c
@@ -191,7 +191,8 @@ void ipa_interrupt_add(struct ipa_interrupt *interrupt,
 	struct ipa *ipa = interrupt->ipa;
 	u32 offset;
 
-	WARN_ON(ipa_irq >= IPA_IRQ_COUNT);
+	if (WARN_ON(ipa_irq >= IPA_IRQ_COUNT))
+		return;
 
 	interrupt->handler[ipa_irq] = handler;
 
@@ -208,7 +209,8 @@ ipa_interrupt_remove(struct ipa_interrupt *interrupt, enum ipa_irq_id ipa_irq)
 	struct ipa *ipa = interrupt->ipa;
 	u32 offset;
 
-	WARN_ON(ipa_irq >= IPA_IRQ_COUNT);
+	if (WARN_ON(ipa_irq >= IPA_IRQ_COUNT))
+		return;
 
 	/* Update the IPA interrupt mask to disable it */
 	interrupt->enabled &= ~BIT(ipa_irq);
-- 
2.34.3


             reply	other threads:[~2022-05-19  0:44 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-19  0:44 Jakub Kicinski [this message]
2022-05-19  1:22 ` Alex Elder
2022-05-20  1:50 ` patchwork-bot+netdevbpf

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