From: Ard Biesheuvel <ardb@kernel.org>
To: linux-efi@vger.kernel.org, Ingo Molnar <mingo@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>
Cc: Ard Biesheuvel <ardb@kernel.org>,
linux-kernel@vger.kernel.org,
Arvind Sankar <nivedita@alum.mit.edu>,
Benjamin Thiel <b.thiel@posteo.de>,
Borislav Petkov <bp@alien8.de>, Dave Young <dyoung@redhat.com>,
Heinrich Schuchardt <xypron.glpk@gmx.de>,
Javier Martinez Canillas <javierm@redhat.com>,
Jerry Snitselaar <jsnitsel@redhat.com>,
Lenny Szubowicz <lszubowi@redhat.com>,
linux-acpi@vger.kernel.org, Loic Yhuel <loic.yhuel@gmail.com>,
Matthew Garrett <mjg59@google.com>,
Mike Lothian <mike@fireburn.co.uk>,
Punit Agrawal <punit1.agrawal@toshiba.co.jp>
Subject: [PATCH 1/7] efi/libstub: Avoid returning uninitialized data from setup_graphics()
Date: Sun, 17 May 2020 14:57:48 +0200 [thread overview]
Message-ID: <20200517125754.8934-2-ardb@kernel.org> (raw)
In-Reply-To: <20200517125754.8934-1-ardb@kernel.org>
From: Heinrich Schuchardt <xypron.glpk@gmx.de>
Currently, setup_graphics() ignores the return value of efi_setup_gop(). As
AllocatePool() does not zero out memory, the screen information table will
contain uninitialized 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>
Link: https://lore.kernel.org/r/20200426194946.112768-1-xypron.glpk@gmx.de
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
drivers/firmware/efi/libstub/arm-stub.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/firmware/efi/libstub/arm-stub.c b/drivers/firmware/efi/libstub/arm-stub.c
index 99a5cde7c2d8..48161b1dd098 100644
--- a/drivers/firmware/efi/libstub/arm-stub.c
+++ b/drivers/firmware/efi/libstub/arm-stub.c
@@ -60,7 +60,11 @@ 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;
}
--
2.17.1
next prev parent reply other threads:[~2020-05-17 12:58 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-17 12:57 [GIT PULL 0/7] EFI fixes for v5.7 Ard Biesheuvel
2020-05-17 12:57 ` Ard Biesheuvel [this message]
2020-05-17 12:57 ` [PATCH 2/7] efi/earlycon: Fix early printk for wider fonts Ard Biesheuvel
2020-05-17 12:57 ` [PATCH 3/7] efi/libstub/x86: Avoid EFI map buffer alloc in allocate_e820() Ard Biesheuvel
2020-05-17 12:57 ` [PATCH 4/7] efi: cper: Add support for printing Firmware Error Record Reference Ard Biesheuvel
2020-05-17 12:57 ` [PATCH 5/7] x86/boot: Mark global variables as static Ard Biesheuvel
2020-05-17 12:57 ` [PATCH 6/7] efi: Pull up arch-specific prototype efi_systab_show_arch() Ard Biesheuvel
2020-05-17 12:57 ` [PATCH 7/7] tpm: check event log version before reading final events Ard Biesheuvel
2020-05-18 9:07 ` [GIT PULL 0/7] EFI fixes for v5.7 Borislav Petkov
2020-05-18 9:15 ` Ard Biesheuvel
2020-05-22 13:06 ` Ard Biesheuvel
2020-05-22 13:40 ` Borislav Petkov
2020-05-22 13:44 ` Ard Biesheuvel
2020-05-22 14:04 ` Thomas Gleixner
2020-05-22 14:45 ` Ard Biesheuvel
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