From: Markus Schneider-Pargmann <msp@baylibre.com>
The algorithms in nvmem core are built with the constraint that
bit_offset < 8. If bit_offset is greater the results are wrong. Print an
error if the devicetree 'bits' property is outside of the valid range
and abort parsing.
Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
---
drivers/nvmem/core.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 980123fb4dde..a9832b5a608e 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -806,6 +806,11 @@ static int nvmem_add_cells_from_dt(struct nvmem_device *nvmem, struct device_nod
if (addr && len == (2 * sizeof(u32))) {
info.bit_offset = be32_to_cpup(addr++);
info.nbits = be32_to_cpup(addr);
+ if (info.bit_offset >= BITS_PER_BYTE || info.nbits < 1) {
+ dev_err(dev, "nvmem: invalid bits on %pOF\n", child);
+ of_node_put(child);
+ return -EINVAL;
+ }
}
info.np = of_node_get(child);
--
2.25.1