path: root/security/keys/keyctl.c
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authorBrian King <brking@linux.vnet.ibm.com>2010-09-10 09:03:21 +0200
committerJens Axboe <jaxboe@fusionio.com>2010-09-10 09:03:21 +0200
commitbe14eb619108fa8b7120eb2c42d66d5f623ae10e (patch)
treecfc8a496c62a429a97c4bc2c5e638c39374f560b /security/keys/keyctl.c
parentscatterlist: prevent invalid free when alloc fails (diff)
block: Range check cpu in blk_cpu_to_group
While testing CPU DLPAR, the following problem was discovered. We were DLPAR removing the first CPU, which in this case was logical CPUs 0-3. CPUs 0-2 were already marked offline and we were in the process of offlining CPU 3. After marking the CPU inactive and offline in cpu_disable, but before the cpu was completely idle (cpu_die), we ended up in __make_request on CPU 3. There we looked at the topology map to see which CPU to complete the I/O on and found no CPUs in the cpu_sibling_map. This resulted in the block layer setting the completion cpu to be NR_CPUS, which then caused an oops when we tried to complete the I/O. Fix this by sanity checking the value we return from blk_cpu_to_group to be a valid cpu value. Signed-off-by: Brian King <brking@linux.vnet.ibm.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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