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| author | Martin Blumenstingl <martin.blumenstingl@googlemail.com> | 2019-08-18 12:33:42 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-08-18 13:56:52 +0300 |
| commit | cb6b0a393c4a6d43e29ef476d19313c5fef8b6c7 (patch) | |
| tree | 3335943f829b767bd61fac8c98fe72337c3ad08c /drivers/nvmem/meson-mx-efuse.c | |
| parent | 2ac00e34acfc93af19376f83bb31db1aea1f006a (diff) | |
| download | linux-cb6b0a393c4a6d43e29ef476d19313c5fef8b6c7.tar.xz | |
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 <martin.blumenstingl@googlemail.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20190818093345.29647-5-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/nvmem/meson-mx-efuse.c')
| -rw-r--r-- | drivers/nvmem/meson-mx-efuse.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/nvmem/meson-mx-efuse.c b/drivers/nvmem/meson-mx-efuse.c index b9f9ce089de9..07c9f38c1c60 100644 --- a/drivers/nvmem/meson-mx-efuse.c +++ b/drivers/nvmem/meson-mx-efuse.c @@ -155,7 +155,8 @@ 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_t(size_t, bytes - i, efuse->config.word_size)); } meson_mx_efuse_mask_bits(efuse, MESON_MX_EFUSE_CNTL1, |