efi/cper: Fix cper_bits_to_str buffer handling and return value

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commit d7f1b4bdc7 upstream.

The return value calculation was incorrect: `return len - buf_size;`
Initially `len = buf_size`, then `len` decreases with each operation.
This results in a negative return value on success.

Fix by returning `buf_size - len` which correctly calculates the actual
number of bytes written.

Fixes: a976d790f4 ("efi/cper: Add a new helper function to print bitmasks")
Signed-off-by: Morduan Zang <zhangdandan@uniontech.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Morduan Zang 2026-01-14 13:30:33 +08:00 • committed by Greg Kroah-Hartman

parent 1f819393de

commit 81dcb27e9b

1 changed files with 1 additions and 1 deletions

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drivers/firmware/efi/cper.c

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