[PATCH 5.8 146/148] efi/libstub: Handle NULL cmdline

Greg Kroah-Hartman
2020-08-24T08:38:26Z

From: Arvind Sankar <nivedita@alum.mit.edu>

commit a37ca6a2af9df2972372b918f09390c9303acfbd upstream.

Treat a NULL cmdline the same as empty. Although this is unlikely to
happen in practice, the x86 kernel entry does check for NULL cmdline and
handles it, so do it here as well.

Cc: <stable@vger.kernel.org>
Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Link: https://lore.kernel.org/r/20200729193300.598448-1-nivedita@alum.mit.edu
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/firmware/efi/libstub/efi-stub-helper.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

--- a/drivers/firmware/efi/libstub/efi-stub-helper.c
+++ b/drivers/firmware/efi/libstub/efi-stub-helper.c
@@ -187,10 +187,14 @@ int efi_printk(const char *fmt, ...)
*/
efi_status_t efi_parse_options(char const *cmdline)
{
- size_t len = strlen(cmdline) + 1;
+ size_t len;
efi_status_t status;
char *str, *buf;

+ if (!cmdline)
+ return EFI_SUCCESS;
+
+ len = strlen(cmdline) + 1;
status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, len, (void **)&buf);
if (status != EFI_SUCCESS)
return status;