[PATCH] ASoC: omap-mcbsp: Fix use of uninitialised pointer
Commit 9c34d023dc35 ("ASoC: omap-mcbsp: Re-arrange files for core McBSP and Sidetone function split"), in rearranging various files, also replaced calls to platform_get_resource_by_name() + devm_ioremap_resource() with a single call to devm_platform_ioremap_resource_byname(). However, the struct resource is needed as we access its members so at present a null pointer is dereferenced. Fix by doing things the old way.
Addresses-Coverity-ID: 1497530 ("Memory - illegal accesses") Fixes: 9c34d023dc35 ("ASoC: omap-mcbsp: Re-arrange files for core McBSP and Sidetone function split") Signed-off-by: Alex Dewar alex.dewar90@gmail.com --- sound/soc/ti/omap-mcbsp.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/sound/soc/ti/omap-mcbsp.c b/sound/soc/ti/omap-mcbsp.c index 186cea91076f..6025b30bbe77 100644 --- a/sound/soc/ti/omap-mcbsp.c +++ b/sound/soc/ti/omap-mcbsp.c @@ -620,7 +620,11 @@ static int omap_mcbsp_init(struct platform_device *pdev) spin_lock_init(&mcbsp->lock); mcbsp->free = true;
- mcbsp->io_base = devm_platform_ioremap_resource_byname(pdev, "mpu"); + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mpu"); + if (!res) + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + + mcbsp->io_base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(mcbsp->io_base)) return PTR_ERR(mcbsp->io_base);
On Sun, 4 Oct 2020 11:25:36 +0100, Alex Dewar wrote:
Commit 9c34d023dc35 ("ASoC: omap-mcbsp: Re-arrange files for core McBSP and Sidetone function split"), in rearranging various files, also replaced calls to platform_get_resource_by_name() + devm_ioremap_resource() with a single call to devm_platform_ioremap_resource_byname(). However, the struct resource is needed as we access its members so at present a null pointer is dereferenced. Fix by doing things the old way.
Applied to
https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next
Thanks!
[1/1] ASoC: omap-mcbsp: Fix use of uninitialised pointer commit: cd7dea5e17a561e621e78e5863f5634cb6f9f097
All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted.
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Thanks, Mark
On 04/10/2020 13.25, Alex Dewar wrote:
Commit 9c34d023dc35 ("ASoC: omap-mcbsp: Re-arrange files for core McBSP and Sidetone function split"), in rearranging various files, also replaced calls to platform_get_resource_by_name() + devm_ioremap_resource() with a single call to devm_platform_ioremap_resource_byname(). However, the struct resource is needed as we access its members so at present a null pointer is dereferenced. Fix by doing things the old way.
Addresses-Coverity-ID: 1497530 ("Memory - illegal accesses") Fixes: 9c34d023dc35 ("ASoC: omap-mcbsp: Re-arrange files for core McBSP and Sidetone function split")
it is fixing: 31e1fc4f11e2e ("ASoC: ti: omap-mcbsp: use devm_platform_ioremap_resource_byname")
and we should just revert that commit.
Signed-off-by: Alex Dewar alex.dewar90@gmail.com
sound/soc/ti/omap-mcbsp.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/sound/soc/ti/omap-mcbsp.c b/sound/soc/ti/omap-mcbsp.c index 186cea91076f..6025b30bbe77 100644 --- a/sound/soc/ti/omap-mcbsp.c +++ b/sound/soc/ti/omap-mcbsp.c @@ -620,7 +620,11 @@ static int omap_mcbsp_init(struct platform_device *pdev) spin_lock_init(&mcbsp->lock); mcbsp->free = true;
- mcbsp->io_base = devm_platform_ioremap_resource_byname(pdev, "mpu");
- res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mpu");
- if (!res)
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);- mcbsp->io_base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(mcbsp->io_base)) return PTR_ERR(mcbsp->io_base);
- Péter
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participants (3)
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Alex Dewar -
Mark Brown -
Peter Ujfalusi