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Subject[PATCH 5.12 009/161] efi/libstub: prevent read overflow in find_file_option()
Date
From: Dan Carpenter <dan.carpenter@oracle.com>

[ Upstream commit c4039b29fe9637e1135912813f830994af4c867f ]

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 <dan.carpenter@oracle.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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


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