[PATCH AUTOSEL 6.6 07/35] efi: pstore: Return proper errors on UEFI failures

Sasha Levin
2024-06-17T13:23:23Z

From: "Guilherme G. Piccoli" <gpiccoli@igalia.com>

[ Upstream commit 7c23b186ab892088f76a3ad9dbff1685ffe2e832 ]

Right now efi-pstore either returns 0 (success) or -EIO; but we
do have a function to convert UEFI errors in different standard
error codes, helping to narrow down potential issues more accurately.

So, let's use this helper here.

Signed-off-by: Guilherme G. Piccoli <gpiccoli@igalia.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/firmware/efi/efi-pstore.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/firmware/efi/efi-pstore.c b/drivers/firmware/efi/efi-pstore.c
index e7b9ec6f8a86a..5669023bdd1de 100644
--- a/drivers/firmware/efi/efi-pstore.c
+++ b/drivers/firmware/efi/efi-pstore.c
@@ -109,7 +109,7 @@ static int efi_pstore_read_func(struct pstore_record *record,
&size, record->buf);
if (status != EFI_SUCCESS) {
kfree(record->buf);
- return -EIO;
+ return efi_status_to_err(status);
}

/*
@@ -154,7 +154,7 @@ static ssize_t efi_pstore_read(struct pstore_record *record)
return 0;

if (status != EFI_SUCCESS)
- return -EIO;
+ return efi_status_to_err(status);

/* skip variables that don't concern us */
if (efi_guidcmp(guid, LINUX_EFI_CRASH_GUID))
@@ -192,7 +192,7 @@ static int efi_pstore_write(struct pstore_record *record)
record->size, record->psi->buf,
true);
efivar_unlock();
- return status == EFI_SUCCESS ? 0 : -EIO;
+ return efi_status_to_err(status);
};

static int efi_pstore_erase(struct pstore_record *record)
@@ -203,7 +203,7 @@ static int efi_pstore_erase(struct pstore_record *record)
PSTORE_EFI_ATTRIBUTES, 0, NULL);

if (status != EFI_SUCCESS && status != EFI_NOT_FOUND)
- return -EIO;
+ return efi_status_to_err(status);
return 0;
}

--
2.43.0