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authorGrant Likely <grant.likely@linaro.org>2013-10-04 16:24:26 (GMT)
committerGrant Likely <grant.likely@linaro.org>2013-10-15 19:09:18 (GMT)
commitf3cea45a77c8ebdb7efad100e576eb6cb401bf25 (patch)
treeae7be3718ae93dc224bee399384ae07d013d8c07 /drivers/of
parentd1cb9d1af0bc11b7450a6032f43935c746609418 (diff)
downloadlinux-f3cea45a77c8ebdb7efad100e576eb6cb401bf25.tar.xz
of: Fix iteration bug over CPU reg properties
The size of each hwid in a cpu nodes 'reg' property is defined by the parents #address-cells property in the normal way. The cpu parsing code has a bug where it will overrun the end of the property if address-cells is greater than one. This commit fixes the problem by adjusting the array size by the number of address cells. It also makes sure address-cells isn't zero for that would cause an infinite loop. v2: bail if #address-cells is zero instead of forcing to OF_ROOT_NODE_ADDR_CELLS_DEFAULT. Forcing it will cause the reg property to be parsed incorrectly. Signed-off-by: Grant Likely <grant.likely@linaro.org> Cc: Rob Herring <rob.herring@calxeda.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'drivers/of')
-rw-r--r--drivers/of/base.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c
index e4c9945..3ae106d 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -265,9 +265,9 @@ static bool __of_find_n_match_cpu_property(struct device_node *cpun,
ac = of_n_addr_cells(cpun);
cell = of_get_property(cpun, prop_name, &prop_len);
- if (!cell)
+ if (!cell || !ac)
return false;
- prop_len /= sizeof(*cell);
+ prop_len /= sizeof(*cell) * ac;
for (tid = 0; tid < prop_len; tid++) {
hwid = of_read_number(cell, ac);
if (arch_match_cpu_phys_id(cpu, hwid)) {