Commit 564d5011 authored Oct 27, 2015 by Vishal Verma Committed by Dan Williams Nov 02, 2015

nfit: in acpi_nfit_init, break on a 0-length table



If acpi_nfit_init is called (such as from nfit_test), with an nfit table
that has more memory allocated than it needs (and a similarly large
'size' field, add_tables would happily keep adding null SPA Range tables
filling up all available memory.

Make it friendlier by breaking out if a 0-length header is found in any
of the tables.

Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: <linux-acpi@vger.kernel.org>
Cc: <linux-nvdimm@lists.01.org>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

parent 7379047d

drivers/acpi/nfit.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -335,6 +335,12 @@ static void add_table(struct acpi_nfit_desc acpi_desc, void *table,
		return NULL;

		hdr = table;
		if (!hdr->length) {
		dev_warn(dev, "found a zero length table '%d' parsing nfit\n",
		hdr->type);
		return NULL;
		}

		switch (hdr->type) {
		case ACPI_NFIT_TYPE_SYSTEM_ADDRESS:
		if (!add_spa(acpi_desc, table))