linux-kernel - [PATCH V2] efi: efibc: Guard against allocation failure

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Date:   Fri,  9 Sep 2022 16:42:14 -0300
From:   "Guilherme G. Piccoli" <gpiccoli@...lia.com>
To:     linux-efi@...r.kernel.org
Cc:     ardb@...nel.org, linux-kernel@...r.kernel.org,
        kernel-dev@...lia.com, kernel@...ccoli.net,
        matt@...eblueprint.co.uk, mjg59@...f.ucam.org,
        "Guilherme G. Piccoli" <gpiccoli@...lia.com>
Subject: [PATCH V2] efi: efibc: Guard against allocation failure

There is a single kmalloc in this driver, and it's not currently
guarded against allocation failure. Do it here by just bailing-out
the reboot handler, in case this tentative allocation fails.

Fixes: 416581e48679 ("efi: efibc: avoid efivar API for setting variables")
Signed-off-by: Guilherme G. Piccoli <gpiccoli@...lia.com>
---

V2:
* Rebased against 6.0-rc4;
* Dropped from the original series [0].

[0] https://lore.kernel.org/linux-efi/20220729194532.228403-1-gpiccoli@igalia.com/


 drivers/firmware/efi/efibc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/firmware/efi/efibc.c b/drivers/firmware/efi/efibc.c
index 8ced7af8e56d..4f9fb086eab7 100644
--- a/drivers/firmware/efi/efibc.c
+++ b/drivers/firmware/efi/efibc.c
@@ -48,6 +48,9 @@ static int efibc_reboot_notifier_call(struct notifier_block *notifier,
 		return NOTIFY_DONE;
 
 	wdata = kmalloc(MAX_DATA_LEN * sizeof(efi_char16_t), GFP_KERNEL);
+	if (!wdata)
+		return NOTIFY_DONE;
+
 	for (l = 0; l < MAX_DATA_LEN - 1 && str[l] != '\0'; l++)
 		wdata[l] = str[l];
 	wdata[l] = L'\0';
-- 
2.37.2