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Subject[PATCH] nvmem: meson-mx-efuse: allow reading data smaller than word_size
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 <>
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)

- 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,
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