[PATCH 1/1] ath10k: avoid possible memory access violation

[PATCH 1/1] ath10k: avoid possible memory access violation

[K.T.VIJAYAKUMAAR]

array "ctl_power_table" access index "pream" is initialized with -1 and
is raised as a static analysis tool issue.
[drivers\net\wireless\ath\ath10k\wmi.c:4719] ->
[drivers\net\wireless\ath\ath10k\wmi.c:4730]: (error) Array index -1 is
out of bounds.

Since the "pream" index for accessing ctl_power_table array is initialized
with -1, there is a chance of memory access violation for the cases below.
1) wmi_pdev_tpc_final_table_event change frequency is between 2483 and 5180
2) pream_idx is out of the enumeration ranges of wmi_tpc_pream_2ghz,
wmi_tpc_pream_5ghz

Signed-off-by: K.T.VIJAYAKUMAAR <vijay.bvb@samsung.com>
---
 drivers/net/wireless/ath/ath10k/wmi.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/wireless/ath/ath10k/wmi.c b/drivers/net/wireless/ath/ath10k/wmi.c
index 877249a..23502cd 100644
--- a/drivers/net/wireless/ath/ath10k/wmi.c
+++ b/drivers/net/wireless/ath/ath10k/wmi.c
@@ -4721,6 +4721,13 @@ ath10k_wmi_tpc_final_get_rate(struct ath10k *ar,
 		}
 	}
 
+	if (pream == -1) {
+		ath10k_warn(ar, "unknown wmi tpc final: pream_idx[%u], chan_freq[%u]\n",
+			    pream_idx, __le32_to_cpu(ev->chan_freq));
+		tpc = 0;
+		goto out;
+	}
+
 	if (pream == 4)
 		tpc = min_t(u8, ev->rates_array[rate_idx],
 			    ev->max_reg_allow_pow[ch]);
-- 
2.7.4

Re: [PATCH 1/1] ath10k: avoid possible memory access violation

[Kalle Valo]

VIJAYAKUMAAR K T <vijay.bvb@samsung.com> writes:

> It would be great, if this patch could be reviewed.

It's in the queue and you can check the state from patchwork:

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches#checking_state_of_patches_from_patchwork

-- 
Kalle Valo

Re: [PATCH 1/1] ath10k: avoid possible memory access violation

[Kalle Valo]

"K.T.VIJAYAKUMAAR" <vijay.bvb@samsung.com> wrote:

> array "ctl_power_table" access index "pream" is initialized with -1 and
> is raised as a static analysis tool issue.
> [drivers\net\wireless\ath\ath10k\wmi.c:4719] ->
> [drivers\net\wireless\ath\ath10k\wmi.c:4730]: (error) Array index -1 is
> out of bounds.
> 
> Since the "pream" index for accessing ctl_power_table array is initialized
> with -1, there is a chance of memory access violation for the cases below.
> 1) wmi_pdev_tpc_final_table_event change frequency is between 2483 and 5180
> 2) pream_idx is out of the enumeration ranges of wmi_tpc_pream_2ghz,
> wmi_tpc_pream_5ghz
> 
> Signed-off-by: K.T.VIJAYAKUMAAR <vijay.bvb@samsung.com>
> [kvalo@codeaurora.org: clean up the warning message]
> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

Patch applied to ath-next branch of ath.git, thanks.

97c69a70dc2c ath10k: avoid possible memory access violation

-- 
https://patchwork.kernel.org/patch/10554929/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches