From: Florian Fainelli <f.fainelli@gmail.com> To: Joe Burmeister <joe.burmeister@devtank.co.uk>, Mark Brown <broonie@kernel.org>, Ray Jui <rjui@broadcom.com>, Scott Branden <sbranden@broadcom.com>, bcm-kernel-feedback-list@broadcom.com, Nicolas Saenz Julienne <nsaenzjulienne@suse.de>, linux-spi@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] spi: bcm2835: Fix buffer overflow with CS able to go beyond limit. Date: Thu, 22 Apr 2021 09:50:47 -0700 [thread overview] Message-ID: <c087ba2c-7839-02d1-a522-b104d8ffb8d2@gmail.com> (raw) In-Reply-To: <20210420083402.6950-1-joe.burmeister@devtank.co.uk> On 4/20/2021 1:34 AM, Joe Burmeister wrote: > It was previoulsy possible to have a device tree with more chips than > the driver supports and go off the end of CS arrays. Do you mind walking me through the code how that could have happened? We have spi_register_controller() call of_spi_get_gpio_numbers() which has the following: ctlr->num_chipselect = max_t(int, nb, ctlr->num_chipselect); such that what the controller has is the maximum between the number of 'cs-gpios' properties parsed and what was already populated in ctrl->num_chipselect during bcm2835_spi_probe(), which for this driver is BCM2835_SPI_NUM_CS (3). > > This patches inforces CS limit but sets that limit to the max of the > default limit and what is in the device tree when driver is loaded. > > Signed-off-by: Joe Burmeister <joe.burmeister@devtank.co.uk> You have changed many more things that just enforcing a limit on BCM2835_SPI_NUM_CS you have now made all chip-select related data structuresd dynamically allocated and you have changed a number of prints to use the shorthand "dev" instead of &pdev->dev. -- Florian
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From: Florian Fainelli <f.fainelli@gmail.com> To: Joe Burmeister <joe.burmeister@devtank.co.uk>, Mark Brown <broonie@kernel.org>, Ray Jui <rjui@broadcom.com>, Scott Branden <sbranden@broadcom.com>, bcm-kernel-feedback-list@broadcom.com, Nicolas Saenz Julienne <nsaenzjulienne@suse.de>, linux-spi@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] spi: bcm2835: Fix buffer overflow with CS able to go beyond limit. Date: Thu, 22 Apr 2021 09:50:47 -0700 [thread overview] Message-ID: <c087ba2c-7839-02d1-a522-b104d8ffb8d2@gmail.com> (raw) In-Reply-To: <20210420083402.6950-1-joe.burmeister@devtank.co.uk> On 4/20/2021 1:34 AM, Joe Burmeister wrote: > It was previoulsy possible to have a device tree with more chips than > the driver supports and go off the end of CS arrays. Do you mind walking me through the code how that could have happened? We have spi_register_controller() call of_spi_get_gpio_numbers() which has the following: ctlr->num_chipselect = max_t(int, nb, ctlr->num_chipselect); such that what the controller has is the maximum between the number of 'cs-gpios' properties parsed and what was already populated in ctrl->num_chipselect during bcm2835_spi_probe(), which for this driver is BCM2835_SPI_NUM_CS (3). > > This patches inforces CS limit but sets that limit to the max of the > default limit and what is in the device tree when driver is loaded. > > Signed-off-by: Joe Burmeister <joe.burmeister@devtank.co.uk> You have changed many more things that just enforcing a limit on BCM2835_SPI_NUM_CS you have now made all chip-select related data structuresd dynamically allocated and you have changed a number of prints to use the shorthand "dev" instead of &pdev->dev. -- Florian _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-04-22 16:50 UTC|newest] Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-04-20 8:34 [PATCH] spi: bcm2835: Fix buffer overflow with CS able to go beyond limit Joe Burmeister 2021-04-20 8:34 ` Joe Burmeister 2021-04-22 16:42 ` Mark Brown 2021-04-22 16:42 ` Mark Brown 2021-04-22 16:50 ` Florian Fainelli [this message] 2021-04-22 16:50 ` Florian Fainelli 2021-04-22 20:10 ` Joe Burmeister 2021-04-22 20:10 ` Joe Burmeister 2021-04-22 23:49 ` Florian Fainelli 2021-04-22 23:49 ` Florian Fainelli 2021-04-23 10:03 ` Joe Burmeister 2021-04-23 10:03 ` Joe Burmeister 2021-04-23 11:57 ` Mark Brown 2021-04-23 11:57 ` Mark Brown 2021-04-23 14:12 ` Joe Burmeister 2021-04-23 14:12 ` Joe Burmeister 2021-04-23 16:20 ` Mark Brown 2021-04-23 16:20 ` Mark Brown 2021-04-23 17:34 ` Nicolas Saenz Julienne 2021-04-23 17:34 ` Nicolas Saenz Julienne 2021-05-01 19:51 ` Lukas Wunner 2021-05-04 11:51 ` Mark Brown 2021-05-04 11:51 ` Mark Brown 2021-05-04 13:53 ` Lukas Wunner
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