From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
To: colin.king@canonical.com
Cc: alexandre.torgue@st.com, netdev@vger.kernel.org,
kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-stm32@st-md-mailman.stormreply.com, joabreu@synopsys.com,
mcoquelin.stm32@gmail.com, peppe.cavallaro@st.com,
davem@davemloft.net, linux-arm-kernel@lists.infradead.org
Subject: RE: [PATCH] net: stmmac: add sanity check to device_property_read_u32_array call
Date: Wed, 19 Jun 2019 07:13:08 +0200 [thread overview]
Message-ID: <20190619051308.23582-1-martin.blumenstingl@googlemail.com> (raw)
In-Reply-To: <20190617165836.4673-1-colin.king@canonical.com>
Hi Colin,
> Currently the call to device_property_read_u32_array is not error checked
> leading to potential garbage values in the delays array that are then used
> in msleep delays. Add a sanity check to the property fetching.
>
> Addresses-Coverity: ("Uninitialized scalar variable")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
I have also sent a patch [0] to fix initialize the array.
can you please look at my patch so we can work out which one to use?
my concern is that the "snps,reset-delays-us" property is optional,
the current dt-bindings documentation states that it's a required
property. in reality it isn't, there are boards (two examples are
mentioned in my patch: [0]) without it.
so I believe that the resulting behavior has to be:
1. don't delay if this property is missing (instead of delaying for
<garbage value> ms)
2. don't error out if this property is missing
your patch covers #1, can you please check whether #2 is also covered?
I tested case #2 when submitting my patch and it worked fine (even
though I could not reproduce the garbage values which are being read
on some boards)
Thank you!
Martin
[0] https://lkml.org/lkml/2019/4/19/638
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next prev parent reply other threads:[~2019-06-19 5:13 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-17 16:58 [PATCH] net: stmmac: add sanity check to device_property_read_u32_array call Colin King
2019-06-19 1:04 ` David Miller
2019-06-19 5:13 ` Martin Blumenstingl [this message]
2019-06-19 6:55 ` Colin Ian King
2019-06-20 1:34 ` Martin Blumenstingl
2019-06-25 4:44 ` Martin Blumenstingl
2019-06-25 7:58 ` Colin Ian King
2019-06-28 4:15 ` Martin Blumenstingl
2019-06-28 8:32 ` Colin Ian King
2019-06-28 16:05 ` Martin Blumenstingl
2019-07-01 22:43 ` Martin Blumenstingl
2019-07-02 6:48 ` Colin Ian King
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