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| author | Khazhismel Kumykov <khazhy@chromium.org> | 2023-01-17 17:02:12 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-24 07:11:50 +0100 |
| commit | 32313c11bdc8a02c577abaf865be3664ab30410a (patch) | |
| tree | 3d8e5c6df6bfb0472608daf4b8203729ae9aecd5 | |
| parent | 8ee291ae493d607be269fb76d2bab5ad39c039f7 (diff) | |
| download | linux-stable-32313c11bdc8a02c577abaf865be3664ab30410a.tar.gz linux-stable-32313c11bdc8a02c577abaf865be3664ab30410a.tar.bz2 linux-stable-32313c11bdc8a02c577abaf865be3664ab30410a.zip | |
gsmi: fix null-deref in gsmi_get_variable
commit a769b05eeed7accc4019a1ed9799dd72067f1ce8 upstream.
We can get EFI variables without fetching the attribute, so we must
allow for that in gsmi.
commit 859748255b43 ("efi: pstore: Omit efivars caching EFI varstore
access layer") added a new get_variable call with attr=NULL, which
triggers panic in gsmi.
Fixes: 74c5b31c6618 ("driver: Google EFI SMI")
Cc: stable <stable@kernel.org>
Signed-off-by: Khazhismel Kumykov <khazhy@google.com>
Link: https://lore.kernel.org/r/20230118010212.1268474-1-khazhy@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/firmware/google/gsmi.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/firmware/google/gsmi.c b/drivers/firmware/google/gsmi.c index 2e3ef0eb6e82..e50dd4030d90 100644 --- a/drivers/firmware/google/gsmi.c +++ b/drivers/firmware/google/gsmi.c @@ -343,9 +343,10 @@ static efi_status_t gsmi_get_variable(efi_char16_t *name, memcpy(data, gsmi_dev.data_buf->start, *data_size); /* All variables are have the following attributes */ - *attr = EFI_VARIABLE_NON_VOLATILE | - EFI_VARIABLE_BOOTSERVICE_ACCESS | - EFI_VARIABLE_RUNTIME_ACCESS; + if (attr) + *attr = EFI_VARIABLE_NON_VOLATILE | + EFI_VARIABLE_BOOTSERVICE_ACCESS | + EFI_VARIABLE_RUNTIME_ACCESS; } spin_unlock_irqrestore(&gsmi_dev.lock, flags); |