[PATCH next-next] bnxt: avoid overflow in bnxt_get_nvram_directory()

[PATCH next-next] bnxt: avoid overflow in bnxt_get_nvram_directory()

[Maxim Korotkov]

The value of an arithmetic expression is subject
of possible overflow due to a failure to cast operands to a larger data
type before performing arithmetic. Used macro for multiplication instead
operator for avoiding overflow.

Found by Security Code and Linux Verification
Center (linuxtesting.org) with SVACE.

Signed-off-by: Maxim Korotkov <korotkov.maxim.s@gmail.com>
Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
---

 drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
index ec573127b707..696f32dfe41f 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
@@ -2862,7 +2862,7 @@ static int bnxt_get_nvram_directory(struct net_device *dev, u32 len, u8 *data)
 	if (rc)
 		return rc;
 
-	buflen = dir_entries * entry_length;
+	buflen = mul_u32_u32(dir_entries, entry_length);
 	buf = hwrm_req_dma_slice(bp, req, buflen, &dma_handle);
 	if (!buf) {
 		hwrm_req_drop(bp, req);
-- 
2.37.2

Re: [PATCH next-next] bnxt: avoid overflow in bnxt_get_nvram_directory()

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net-next.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Thu,  9 Mar 2023 20:43:47 +0300 you wrote:
> The value of an arithmetic expression is subject
> of possible overflow due to a failure to cast operands to a larger data
> type before performing arithmetic. Used macro for multiplication instead
> operator for avoiding overflow.
> 
> Found by Security Code and Linux Verification
> Center (linuxtesting.org) with SVACE.
> 
> [...]

Here is the summary with links:
  - [next-next] bnxt: avoid overflow in bnxt_get_nvram_directory()
    https://git.kernel.org/netdev/net-next/c/7c6dddc239ab

You are awesome, thank you!
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