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efi: efibc: Guard against allocation failure

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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: 416581e486 ("efi: efibc: avoid efivar API for setting variables")
Signed-off-by: Guilherme G. Piccoli <gpiccoli@igalia.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Guilherme G. Piccoli 2022-09-09 16:42:14 -03:00 committed by Ard Biesheuvel
parent 9cb636b5f6
commit 7da5b13dcc
1 changed files with 3 additions and 0 deletions
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3
drivers/firmware/efi/efibc.c
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@ -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';