linux-kernel - RE: [EXT] [PATCH][next][RFC] qed: Initialize debug string array

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Message-ID: <MWHPR18MB10712FAF925C572621A5B1EDB2B19@MWHPR18MB1071.namprd18.prod.outlook.com>
Date:   Thu, 7 Oct 2021 05:11:32 +0000
From:   Prabhakar Kushwaha <pkushwaha@...vell.com>
To:     Tim Gardner <tim.gardner@...onical.com>,
        Ariel Elior <aelior@...vell.com>
CC:     GR-everest-linux-l2 <GR-everest-linux-l2@...vell.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Shai Malin <smalin@...vell.com>,
        Omkar Kulkarni <okulkarni@...vell.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [EXT] [PATCH][next][RFC] qed: Initialize debug string array

Hi Tim,


> -----Original Message-----
> From: Tim Gardner <tim.gardner@...onical.com>
> Sent: Wednesday, October 6, 2021 7:33 PM
> To: Ariel Elior <aelior@...vell.com>
> Cc: tim.gardner@...onical.com; GR-everest-linux-l2 <GR-everest-linux-
> l2@...vell.com>; David S. Miller <davem@...emloft.net>; Jakub Kicinski
> <kuba@...nel.org>; Shai Malin <smalin@...vell.com>; Omkar Kulkarni
> <okulkarni@...vell.com>; Prabhakar Kushwaha <pkushwaha@...vell.com>;
> netdev@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: [EXT] [PATCH][next][RFC] qed: Initialize debug string array
> 
> External Email
> 
> ----------------------------------------------------------------------
> Coverity complains of an uninitialized variable.
> 
> CID 120847 (#1 of 1): Uninitialized scalar variable (UNINIT)
> 3. uninit_use_in_call: Using uninitialized value *sw_platform_str when calling
> qed_dump_str_param. [show details]
> 1344        offset += qed_dump_str_param(dump_buf + offset,
> 1345                                     dump, "sw-platform", sw_platform_str);
> 
> Fix this by initializing the string array with '\0'.
> 
> Fixes: 6c95dd8f0aa1d ("qed: Update debug related changes")
> 
> Cc: Ariel Elior <aelior@...vell.com>
> Cc: GR-everest-linux-l2@...vell.com
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Jakub Kicinski <kuba@...nel.org>
> Cc: Shai Malin <smalin@...vell.com>
> Cc: Omkar Kulkarni <okulkarni@...vell.com>
> Cc: Prabhakar Kushwaha <pkushwaha@...vell.com>
> Cc: netdev@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org (open list)
> Signed-off-by: Tim Gardner <tim.gardner@...onical.com>
> ---
> 
> I'm not sure what the value of sw_platform_str should be, but this patch is
> clearly a bandaid and not a proper solution.
> 
> ---
>  drivers/net/ethernet/qlogic/qed/qed_debug.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/net/ethernet/qlogic/qed/qed_debug.c
> b/drivers/net/ethernet/qlogic/qed/qed_debug.c
> index 6d693ee380f1..a393b786c5dc 100644
> --- a/drivers/net/ethernet/qlogic/qed/qed_debug.c
> +++ b/drivers/net/ethernet/qlogic/qed/qed_debug.c
> @@ -1319,6 +1319,8 @@ static u32 qed_dump_common_global_params(struct
> qed_hwfn *p_hwfn,
>  	u32 offset = 0;
>  	u8 num_params;
> 
> +	sw_platform_str[0] = '\0';
> +

Thanks for pointing out.   It is leftover code which I missed to remove.

Proper solution will be below.   Please let me know if you are planning to send this fix else I will post. 

diff --git a/drivers/net/ethernet/qlogic/qed/qed_debug.c b/drivers/net/ethernet/qlogic/qed/qed_debug.c
index 6d693ee380f1..f6198b9a1b02 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_debug.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_debug.c
@@ -1315,7 +1315,6 @@ static u32 qed_dump_common_global_params(struct qed_hwfn *p_hwfn,
                                         u8 num_specific_global_params)
 {
        struct dbg_tools_data *dev_data = &p_hwfn->dbg_info;
-       char sw_platform_str[MAX_SW_PLTAFORM_STR_SIZE];
        u32 offset = 0;
        u8 num_params;

@@ -1341,8 +1340,6 @@ static u32 qed_dump_common_global_params(struct qed_hwfn *p_hwfn,
                                     dump,
                                     "platform",
                                     s_hw_type_defs[dev_data->hw_type].name);
-       offset += qed_dump_str_param(dump_buf + offset,
-                                    dump, "sw-platform", sw_platform_str);
        offset += qed_dump_num_param(dump_buf + offset,
                                     dump, "pci-func", p_hwfn->abs_pf_id);
        offset += qed_dump_num_param(dump_buf + offset,

--pk