lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite for Android: free password hash cracker in your pocket
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date:   Wed, 17 Mar 2021 01:41:48 -0500
From:   "Gustavo A. R. Silva" <>
To:     Jesse Brandeburg <>,
        Tony Nguyen <>,
        "David S. Miller" <>,
        Jakub Kicinski <>
        "Gustavo A. R. Silva" <>,
Subject: [PATCH][next] ixgbe: Fix out-of-bounds warning in

Fix the following out-of-bounds warning by replacing the one-element
array in an anonymous union with a pointer:

  CC [M]  drivers/net/ethernet/intel/ixgbe/ixgbe_common.o
drivers/net/ethernet/intel/ixgbe/ixgbe_common.c: In function ‘ixgbe_host_interface_command’:
drivers/net/ethernet/intel/ixgbe/ixgbe_common.c:3729:13: warning: array subscript 1 is above array bounds of ‘u32[1]’ {aka ‘unsigned int[1]’} [-Warray-bounds]
 3729 |   bp->u32arr[bi] = IXGBE_READ_REG_ARRAY(hw, IXGBE_FLEX_MNG, bi);
      |   ~~~~~~~~~~^~~~
drivers/net/ethernet/intel/ixgbe/ixgbe_common.c:3682:7: note: while referencing ‘u32arr’
 3682 |   u32 u32arr[1];
      |       ^~~~~~

This helps with the ongoing efforts to globally enable -Warray-bounds.

Notice that, the usual approach to fix these sorts of issues is to
replace the one-element array with a flexible-array member. However,
flexible arrays should not be used in unions. That, together with the
fact that the array notation is not being affected in any ways, is why
the pointer approach was chosen in this case.

Signed-off-by: Gustavo A. R. Silva <>
 drivers/net/ethernet/intel/ixgbe/ixgbe_common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
index 62ddb452f862..bff3dc1af702 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
@@ -3679,7 +3679,7 @@ s32 ixgbe_host_interface_command(struct ixgbe_hw *hw, void *buffer,
 	u32 hdr_size = sizeof(struct ixgbe_hic_hdr);
 	union {
 		struct ixgbe_hic_hdr hdr;
-		u32 u32arr[1];
+		u32 *u32arr;
 	} *bp = buffer;
 	u16 buf_len, dword_len;
 	s32 status;

Powered by blists - more mailing lists