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efivarfs: fix error propagation in efivar_entry_get()

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efivar_entry_get() always returns success even if the underlying
__efivar_entry_get() fails, masking errors.

This may result in uninitialized heap memory being copied to userspace
in the efivarfs_file_read() path.

Fix it by returning the error from __efivar_entry_get().

Fixes: 2d82e6227e ("efi: vars: Move efivar caching layer into efivarfs")
Cc: <stable@vger.kernel.org> # v6.1+
Signed-off-by: Kohei Enju <kohei@enjuk.jp>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Kohei Enju
2026-01-17 16:00:45 +00:00
committed by Ard Biesheuvel
parent d7f1b4bdc7
commit 4b22ec1685
1 changed files with 1 additions and 1 deletions
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2
fs/efivarfs/vars.c
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@@ -552,7 +552,7 @@ int efivar_entry_get(struct efivar_entry *entry, u32 *attributes,
err = __efivar_entry_get(entry, attributes, size, data);
efivar_unlock();
return 0;
return err;
}
/**