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nvmem: core: verify cell's raw_len

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[ Upstream commit 13bcd440f2ff38cd7e42a179c223d4b833158b33 ]

Check that the NVMEM cell's raw_len is a aligned to word_size. Otherwise
Otherwise drivers might face incomplete read while accessing the last
part of the NVMEM cell.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20250411112251.68002-10-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dmitry Baryshkov
2025-04-11 12:22:47 +01:00
committed by Greg Kroah-Hartman
parent 04c81ac33a
commit 497f19cacb
1 changed files with 12 additions and 0 deletions
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12
drivers/nvmem/core.c
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@@ -467,6 +467,18 @@ static int nvmem_cell_info_to_nvmem_cell_entry_nodup(struct nvmem_device *nvmem,
return -EINVAL; return -EINVAL;
} }
if (!IS_ALIGNED(cell->raw_len, nvmem->word_size)) {
dev_err(&nvmem->dev,
"cell %s raw len %zd unaligned to nvmem word size %d\n",
cell->name ?: "<unknown>", cell->raw_len,
nvmem->word_size);
if (info->raw_len)
return -EINVAL;
cell->raw_len = ALIGN(cell->raw_len, nvmem->word_size);
}
return 0; return 0;
} }