If the buffer has slashes up to the end then this will read past the end
of the array.  I don't anticipate that this is an issue for many people
in real life, but it's the right thing to do and it makes static
checkers happy.

Fixes: 7a88a6227dc7 ("efi/libstub: Fix path separator regression")
Signed-off-by: Dan Carpenter <redacted>
---
 drivers/firmware/efi/libstub/file.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/firmware/efi/libstub/file.c b/drivers/firmware/efi/libstub/file.c
index 4e81c6077188..dd95f330fe6e 100644
--- a/drivers/firmware/efi/libstub/file.c
+++ b/drivers/firmware/efi/libstub/file.c

@@ -103,7 +103,7 @@ static int find_file_option(const efi_char16_t *cmdline, int cmdline_len,
                return 0;

        /* Skip any leading slashes */
-       while (cmdline[i] == L'/' || cmdline[i] == L'\\')
+       while (i < cmdline_len && (cmdline[i] == L'/' || cmdline[i] == L'\\'))
                i++;

        while (--result_len > 0 && i < cmdline_len) {
--

2.30.2