The patch below does not apply to the 3.12-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 238b1eaa59e6a8e2993af0db9ec2255bfa53927b Mon Sep 17 00:00:00 2001
From: Peter Huewe <PeterHuewe@xxxxxx>
Date: Wed, 30 Oct 2013 01:40:28 +0100
Subject: [PATCH] tpm/tpm_ppi: Check return value of acpi_get_name
If
status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
fails for whatever reason and does not return AE_OK
if (strstr(buffer.pointer, context) != NULL) {
does dereference a null pointer.
-> Check the return value and return the status to the caller
Found by coverity
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Peter Huewe <peterhuewe@xxxxxx>
diff --git a/drivers/char/tpm/tpm_ppi.c b/drivers/char/tpm/tpm_ppi.c
index 18c5810b646b..6ac9d275b732 100644
--- a/drivers/char/tpm/tpm_ppi.c
+++ b/drivers/char/tpm/tpm_ppi.c
@@ -30,6 +30,9 @@ static acpi_status ppi_callback(acpi_handle handle, u32 level, void *context,
acpi_status status;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
+ if (ACPI_FAILURE(status))
+ return status;
+
if (strstr(buffer.pointer, context) != NULL) {
*return_value = handle;
kfree(buffer.pointer);
--
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