From c4039b29fe9637e1135912813f830994af4c867f Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Fri, 23 Apr 2021 14:48:31 +0300 Subject: efi/libstub: prevent read overflow in find_file_option() 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 Signed-off-by: Ard Biesheuvel --- drivers/firmware/efi/libstub/file.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/firmware/efi/libstub/file.c') 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) { -- cgit v1.2.3