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authorMark Rutland <mark.rutland@arm.com>2013-04-23 17:22:49 +0100
committerCatalin Marinas <catalin.marinas@arm.com>2013-04-25 17:45:54 +0100
commit39a90ca639db5fcd33064ddf754793ec85764239 (patch)
treed8a153f03d0a47872729c6cff6b00191da220593 /arch/arm64/lib
parent4339e3f389081ea90e230a785bdbe10eccd02b71 (diff)
downloadlinux-39a90ca639db5fcd33064ddf754793ec85764239.tar.gz
arm64: Survive invalid cpu enable-methods
Currently, if you pass the kernel a dtb where a cpu node has an unsupported enable-method property (e.g. "not-psci"), it'll explode horribly, as it iterates over the enable_ops array incorrectly. It increments the pointer *at* the current element, rather than incrementing the pointer *to* the current element. As the first two elements pointed to structures that were contiguous in memory, this happened to be equivalent. However the third element is NULL, so when the list is exhausted, smp_get_enable_ops generates the wrong pointer, and dereferences an arbitrary portion of memory, which currently happens to contain zero. This patch fixes this by indirecting the pointer one level, so we iterate over the array elements correctly, avoiding the below panic: Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/lib')
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