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cros_ec: Correct comparison between signed and unsigned numbers 

Due to signed/unsigned comparison, '< sizeof(struct)' does not do the right
thing, since if ec_command() returns a -ve number we will consider this be
success.

Adjust all comparisons to avoid this problem.

This error was found with sandbox, which gives a segfault in this case. On
ARM we may instead silently fail.

We should also consider turning on -Wsign-compare to catch this sort of thing
in future.

Reviewed-by: Andrew Chew <achew@nvidia.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
Tested-by: Andrew Chew <achew@nvidia.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Jimmy Zhang <jimmzhang@nvidia.com>
utp
Simon Glass 2014-02-27 13:26:11 -07:00
parent a607028331
commit 2ab83f0d75
1 changed files with 18 additions and 16 deletions
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34
drivers/misc/cros_ec.c
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@ -21,6 +21,7 @@
#include <fdtdec.h>
#include <malloc.h>
#include <spi.h>
#include <asm/errno.h>
#include <asm/io.h>
#include <asm-generic/gpio.h>
@ -298,7 +299,7 @@ static int ec_command_inptr(struct cros_ec_dev *dev, uint8_t cmd,
int cmd_version, const void *dout, int dout_len, uint8_t **dinp,
int din_len)
{
uint8_t *din;
uint8_t *din = NULL;
int len;
len = send_command(dev, cmd, cmd_version, dout, dout_len,
@ -306,7 +307,7 @@ static int ec_command_inptr(struct cros_ec_dev *dev, uint8_t cmd,
/* If the command doesn't complete, wait a while */
if (len == -EC_RES_IN_PROGRESS) {
struct ec_response_get_comms_status *resp;
struct ec_response_get_comms_status *resp = NULL;
ulong start;
/* Wait for command to complete */
@ -334,7 +335,8 @@ static int ec_command_inptr(struct cros_ec_dev *dev, uint8_t cmd,
NULL, 0, &din, din_len);
}
debug("%s: len=%d, dinp=%p, *dinp=%p\n", __func__, len, dinp, *dinp);
debug("%s: len=%d, dinp=%p, *dinp=%p\n", __func__, len, dinp,
dinp ? *dinp : NULL);
if (dinp) {
/* If we have any data to return, it must be 64bit-aligned */
assert(len <= 0 || !((uintptr_t)din & 7));
@ -386,7 +388,7 @@ static int ec_command(struct cros_ec_dev *dev, uint8_t cmd, int cmd_version,
int cros_ec_scan_keyboard(struct cros_ec_dev *dev, struct mbkp_keyscan *scan)
{
if (ec_command(dev, EC_CMD_MKBP_STATE, 0, NULL, 0, scan,
sizeof(scan->data)) < sizeof(scan->data))
sizeof(scan->data)) != sizeof(scan->data))
return -1;
return 0;
@ -397,10 +399,10 @@ int cros_ec_read_id(struct cros_ec_dev *dev, char *id, int maxlen)
struct ec_response_get_version *r;
if (ec_command_inptr(dev, EC_CMD_GET_VERSION, 0, NULL, 0,
(uint8_t **)&r, sizeof(*r)) < sizeof(*r))
(uint8_t **)&r, sizeof(*r)) != sizeof(*r))
return -1;
if (maxlen > sizeof(r->version_string_ro))
if (maxlen > (int)sizeof(r->version_string_ro))
maxlen = sizeof(r->version_string_ro);
switch (r->current_image) {
@ -423,7 +425,7 @@ int cros_ec_read_version(struct cros_ec_dev *dev,
{
if (ec_command_inptr(dev, EC_CMD_GET_VERSION, 0, NULL, 0,
(uint8_t **)versionp, sizeof(**versionp))
< sizeof(**versionp))
!= sizeof(**versionp))
return -1;
return 0;
@ -444,7 +446,7 @@ int cros_ec_read_current_image(struct cros_ec_dev *dev,
struct ec_response_get_version *r;
if (ec_command_inptr(dev, EC_CMD_GET_VERSION, 0, NULL, 0,
(uint8_t **)&r, sizeof(*r)) < sizeof(*r))
(uint8_t **)&r, sizeof(*r)) != sizeof(*r))
return -1;
*image = r->current_image;
@ -578,7 +580,7 @@ int cros_ec_interrupt_pending(struct cros_ec_dev *dev)
{
/* no interrupt support : always poll */
if (!fdt_gpio_isvalid(&dev->ec_int))
return 1;
return -ENOENT;
return !gpio_get_value(dev->ec_int.gpio);
}
@ -586,7 +588,7 @@ int cros_ec_interrupt_pending(struct cros_ec_dev *dev)
int cros_ec_info(struct cros_ec_dev *dev, struct ec_response_mkbp_info *info)
{
if (ec_command(dev, EC_CMD_MKBP_INFO, 0, NULL, 0, info,
sizeof(*info)) < sizeof(*info))
sizeof(*info)) != sizeof(*info))
return -1;
return 0;
@ -601,7 +603,7 @@ int cros_ec_get_host_events(struct cros_ec_dev *dev, uint32_t *events_ptr)
* used by ACPI/SMI.
*/
if (ec_command_inptr(dev, EC_CMD_HOST_EVENT_GET_B, 0, NULL, 0,
(uint8_t **)&resp, sizeof(*resp)) < sizeof(*resp))
(uint8_t **)&resp, sizeof(*resp)) < (int)sizeof(*resp))
return -1;
if (resp->mask & EC_HOST_EVENT_MASK(EC_HOST_EVENT_INVALID))
@ -639,7 +641,7 @@ int cros_ec_flash_protect(struct cros_ec_dev *dev,
if (ec_command(dev, EC_CMD_FLASH_PROTECT, EC_VER_FLASH_PROTECT,
&params, sizeof(params),
resp, sizeof(*resp)) < sizeof(*resp))
resp, sizeof(*resp)) != sizeof(*resp))
return -1;
return 0;
@ -889,7 +891,7 @@ int cros_ec_flash_update_rw(struct cros_ec_dev *dev,
if (cros_ec_flash_offset(dev, EC_FLASH_REGION_RW, &rw_offset, &rw_size))
return -1;
if (image_size > rw_size)
if (image_size > (int)rw_size)
return -1;
/* Invalidate the existing hash, just in case the AP reboots
@ -975,7 +977,7 @@ int cros_ec_get_ldo(struct cros_ec_dev *dev, uint8_t index, uint8_t *state)
if (ec_command_inptr(dev, EC_CMD_LDO_GET, 0,
&params, sizeof(params),
(uint8_t **)&resp, sizeof(*resp)) < sizeof(*resp))
(uint8_t **)&resp, sizeof(*resp)) != sizeof(*resp))
return -1;
*state = resp->state;
@ -1436,10 +1438,10 @@ static int do_cros_ec(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
if (!ret) {
/* Print versions */
printf("RO version: %1.*s\n",
sizeof(p->version_string_ro),
(int)sizeof(p->version_string_ro),
p->version_string_ro);
printf("RW version: %1.*s\n",
sizeof(p->version_string_rw),
(int)sizeof(p->version_string_rw),
p->version_string_rw);
printf("Firmware copy: %s\n",
(p->current_image <