* [PATCH 1/1] efi/libstub: setup_graphics() do not return random data
@ 2020-04-26 19:49 Heinrich Schuchardt
2020-04-27 6:52 ` Ard Biesheuvel
0 siblings, 1 reply; 2+ messages in thread
From: Heinrich Schuchardt @ 2020-04-26 19:49 UTC (permalink / raw)
To: Ard Biesheuvel; +Cc: Ingo Molnar, linux-efi, linux-kernel, Heinrich Schuchardt
Currently setup_graphics() ignores the return value of efi_setup_gop(). As
AllocatePool() does not zero out memory the screen information table will
contain random data in this case.
We should free the screen information table if efi_setup_gop() returns an
error code.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
---
drivers/firmware/efi/libstub/efi-stub.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/firmware/efi/libstub/efi-stub.c b/drivers/firmware/efi/libstub/efi-stub.c
index ee225b323687..60377e5ceab3 100644
--- a/drivers/firmware/efi/libstub/efi-stub.c
+++ b/drivers/firmware/efi/libstub/efi-stub.c
@@ -55,7 +55,11 @@ static struct screen_info *setup_graphics(void)
si = alloc_screen_info();
if (!si)
return NULL;
- efi_setup_gop(si, &gop_proto, size);
+ status = efi_setup_gop(si, &gop_proto, size);
+ if (status != EFI_SUCCESS) {
+ free_screen_info(si);
+ return NULL;
+ }
}
return si;
}
--
2.26.2
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH 1/1] efi/libstub: setup_graphics() do not return random data
2020-04-26 19:49 [PATCH 1/1] efi/libstub: setup_graphics() do not return random data Heinrich Schuchardt
@ 2020-04-27 6:52 ` Ard Biesheuvel
0 siblings, 0 replies; 2+ messages in thread
From: Ard Biesheuvel @ 2020-04-27 6:52 UTC (permalink / raw)
To: Heinrich Schuchardt; +Cc: Ingo Molnar, linux-efi, Linux Kernel Mailing List
On Sun, 26 Apr 2020 at 21:49, Heinrich Schuchardt <xypron.glpk@gmx.de> wrote:
>
> Currently setup_graphics() ignores the return value of efi_setup_gop(). As
> AllocatePool() does not zero out memory the screen information table will
> contain random data in this case.
>
> We should free the screen information table if efi_setup_gop() returns an
> error code.
>
> Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Thanks Heinrich
I will take this as a fix
> ---
> drivers/firmware/efi/libstub/efi-stub.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/firmware/efi/libstub/efi-stub.c b/drivers/firmware/efi/libstub/efi-stub.c
> index ee225b323687..60377e5ceab3 100644
> --- a/drivers/firmware/efi/libstub/efi-stub.c
> +++ b/drivers/firmware/efi/libstub/efi-stub.c
> @@ -55,7 +55,11 @@ static struct screen_info *setup_graphics(void)
> si = alloc_screen_info();
> if (!si)
> return NULL;
> - efi_setup_gop(si, &gop_proto, size);
> + status = efi_setup_gop(si, &gop_proto, size);
> + if (status != EFI_SUCCESS) {
> + free_screen_info(si);
> + return NULL;
> + }
> }
> return si;
> }
> --
> 2.26.2
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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