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| author | Vishal Verma <vishal.l.verma@intel.com> | 2015-10-27 16:58:26 -0600 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2015-11-02 15:28:07 -0500 |
| commit | 564d501187317f8df79ddda173cf23735cbddd16 (patch) | |
| tree | a3e5b42f64ee57bfe4df97b6ac405fcb27ee82c2 /drivers/acpi/nfit.c | |
| parent | 7379047d5585187d1288486d4627873170d0005a (diff) | |
| download | linux-564d501187317f8df79ddda173cf23735cbddd16.tar.gz | |
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>
Diffstat (limited to 'drivers/acpi/nfit.c')
| -rw-r--r-- | drivers/acpi/nfit.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c index c1b8d03e262e..35b4b5693110 100644 --- a/drivers/acpi/nfit.c +++ b/drivers/acpi/nfit.c @@ -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)) |