Some Amlogic boards store the Ethernet MAC address inside the eFuse. The Ethernet MAC address uses 6 bytes. The existing logic in meson_mx_efuse_read() would write beyond the end of the data buffer when trying to read data with a size that is not aligned to word_size (4 bytes on Meson8, Meson8b and Meson8m2).
Calculate the remaining data to copy inside meson_mx_efuse_read() so reading 6 bytes doesn't write beyond the end of the data buffer. Signed-off-by: Martin Blumenstingl <[email protected]> --- drivers/nvmem/meson-mx-efuse.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/nvmem/meson-mx-efuse.c b/drivers/nvmem/meson-mx-efuse.c index 2976aef87c82..d5ccde1abd8e 100644 --- a/drivers/nvmem/meson-mx-efuse.c +++ b/drivers/nvmem/meson-mx-efuse.c @@ -155,7 +155,7 @@ static int meson_mx_efuse_read(void *context, unsigned int offset, if (err) break; - memcpy(buf + i, &tmp, efuse->config.word_size); + memcpy(buf + i, &tmp, min(bytes - i, efuse->config.word_size)); } meson_mx_efuse_mask_bits(efuse, MESON_MX_EFUSE_CNTL1, -- 2.22.0
