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ARM: 7585/1: kernel: fix nr_cpu_ids check in DT logical map init

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If a kernel is configured with a DT containing more /cpu nodes than
nr_cpu_ids, the number of cpus must be capped in the DT parsing
code. Current code carries out the check, but fails to cap the
value and the check is executed after the cpu logical index is used,
which can lead to memory corruption due to index overflow.

This patch refactors the check against nr_cpu_ids and move it before
any computed index is used in the parsing code.

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Reported-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Lorenzo Pieralisi 2012-11-22 18:02:54 +01:00 committed by Russell King
parent c7cc504bc3
commit ce7b175656
1 changed files with 7 additions and 3 deletions
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10
arch/arm/kernel/devtree.c
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@ -139,12 +139,16 @@ void __init arm_dt_init_cpu_maps(void)
i = cpuidx++;
}
tmp_map[i] = hwid;
if (cpuidx > nr_cpu_ids)
if (WARN(cpuidx > nr_cpu_ids, "DT /cpu %u nodes greater than "
"max cores %u, capping them\n",
cpuidx, nr_cpu_ids)) {
cpuidx = nr_cpu_ids;
break;
}
tmp_map[i] = hwid;
}
if (WARN(!bootcpu_valid, "DT missing boot CPU MPIDR[23:0], "
"fall back to default cpu_logical_map\n"))
return;