[patch i2o 1/6] i2o_cfg_passthru cleanup

Vasily Averin
2007-05-15T12:42:48Z

This patch fixes a number of issues in i2o_cfg_passthru{,32}:
- i2o_msg_get_wait() return vaile is not checked;
- i2o_message memory leaks on error paths;
- infinite loop to sg_list_cleanup in passthru32

it's important issue because of i2o_cfg_passthru is used by raidutils for
monitorig controllers state, and in case of memory shortage it leads to the
node crash or disk IO stall.

Signed-off-by: Vasily Averin <vvs@sw.ru>

--- lk2.6/drivers/message/i2o/i2o_config.c
+++ lk2.6/drivers/message/i2o/i2o_config.c
@@ -554,8 +554,6 @@ static int i2o_cfg_passthru32(struct fil
return -ENXIO;
}

- msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
-
sb = c->status_block.virt;

if (get_user(size, &user_msg[0])) {
@@ -573,24 +571,30 @@ static int i2o_cfg_passthru32(struct fil

size <<= 2; // Convert to bytes

+ msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
+ if (IS_ERR(msg))
+ return PTR_ERR(msg);
+
+ rcode = -EFAULT;
/* Copy in the user's I2O command */
if (copy_from_user(msg, user_msg, size)) {
osm_warn("unable to copy user message\n");
- return -EFAULT;
+ goto out;
}
i2o_dump_message(msg);

if (get_user(reply_size, &user_reply[0]) < 0)
- return -EFAULT;
+ goto out;

reply_size >>= 16;
reply_size <<= 2;

+ rcode = -ENOMEM;
reply = kzalloc(reply_size, GFP_KERNEL);
if (!reply) {
printk(KERN_WARNING "%s: Could not allocate reply buffer\n",
c->name);
- return -ENOMEM;
+ goto out;
}

sg_offset = (msg->u.head[0] >> 4) & 0x0f;
@@ -661,13 +665,14 @@ static int i2o_cfg_passthru32(struct fil
}

rcode = i2o_msg_post_wait(c, msg, 60);
+ msg = NULL;
if (rcode) {
reply[4] = ((u32) rcode) << 24;
goto sg_list_cleanup;
}

if (sg_offset) {
- u32 msg[I2O_OUTBOUND_MSG_FRAME_SIZE];
+ u32 rmsg[I2O_OUTBOUND_MSG_FRAME_SIZE];
/* Copy back the Scatter Gather buffers back to user space */
u32 j;
// TODO 64bit fix
@@ -675,7 +680,7 @@ static int i2o_cfg_passthru32(struct fil
int sg_size;

// re-acquire the original message to handle correctly the sg copy operation
- memset(&msg, 0, I2O_OUTBOUND_MSG_FRAME_SIZE * 4);
+ memset(&rmsg, 0, I2O_OUTBOUND_MSG_FRAME_SIZE * 4);
// get user msg size in u32s
if (get_user(size, &user_msg[0])) {
rcode = -EFAULT;
@@ -684,7 +689,7 @@ static int i2o_cfg_passthru32(struct fil
size = size >> 16;
size *= 4;
/* Copy in the user's I2O command */
- if (copy_from_user(msg, user_msg, size)) {
+ if (copy_from_user(rmsg, user_msg, size)) {
rcode = -EFAULT;
goto sg_list_cleanup;
}
@@ -692,7 +697,7 @@ static int i2o_cfg_passthru32(struct fil
(size - sg_offset * 4) / sizeof(struct sg_simple_element);

// TODO 64bit fix
- sg = (struct sg_simple_element *)(msg + sg_offset);
+ sg = (struct sg_simple_element *)(rmsg + sg_offset);
for (j = 0; j < sg_count; j++) {
/* Copy out the SG list to user's buffer if necessary */
if (!
@@ -714,7 +719,7 @@ static int i2o_cfg_passthru32(struct fil
}
}

- sg_list_cleanup:
+sg_list_cleanup:
/* Copy back the reply to user space */
if (reply_size) {
// we wrote our own values for context - now restore the user supplied ones
@@ -723,7 +728,6 @@ static int i2o_cfg_passthru32(struct fil
"%s: Could not copy message context FROM user\n",
c->name);
rcode = -EFAULT;
- goto sg_list_cleanup;
}
if (copy_to_user(user_reply, reply, reply_size)) {
printk(KERN_WARNING
@@ -731,12 +735,14 @@ static int i2o_cfg_passthru32(struct fil
rcode = -EFAULT;
}
}
-
for (i = 0; i < sg_index; i++)
i2o_dma_free(&c->pdev->dev, &sg_list[i]);

- cleanup:
+cleanup:
kfree(reply);
+ if (msg)
+out:
+ i2o_msg_nop(c, msg);
return rcode;
}

@@ -793,8 +799,6 @@ static int i2o_cfg_passthru(unsigned lon
return -ENXIO;
}

- msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
-
sb = c->status_block.virt;

if (get_user(size, &user_msg[0]))
@@ -810,12 +814,17 @@ static int i2o_cfg_passthru(unsigned lon

size <<= 2; // Convert to bytes

+ msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
+ if (IS_ERR(msg))
+ return PTR_ERR(msg);
+
+ rcode = -EFAULT;
/* Copy in the user's I2O command */
if (copy_from_user(msg, user_msg, size))
- return -EFAULT;
+ goto out;

if (get_user(reply_size, &user_reply[0]) < 0)
- return -EFAULT;
+ goto out;

reply_size >>= 16;
reply_size <<= 2;
@@ -824,7 +833,8 @@ static int i2o_cfg_passthru(unsigned lon
if (!reply) {
printk(KERN_WARNING "%s: Could not allocate reply buffer\n",
c->name);
- return -ENOMEM;
+ rcode = -ENOMEM;
+ goto out;
}

sg_offset = (msg->u.head[0] >> 4) & 0x0f;
@@ -891,13 +901,14 @@ static int i2o_cfg_passthru(unsigned lon
}

rcode = i2o_msg_post_wait(c, msg, 60);
+ msg = NULL;
if (rcode) {
reply[4] = ((u32) rcode) << 24;
goto sg_list_cleanup;
}

if (sg_offset) {
- u32 msg[128];
+ u32 rmsg[128];
/* Copy back the Scatter Gather buffers back to user space */
u32 j;
// TODO 64bit fix
@@ -905,7 +916,7 @@ static int i2o_cfg_passthru(unsigned lon
int sg_size;

// re-acquire the original message to handle correctly the sg copy operation
- memset(&msg, 0, I2O_OUTBOUND_MSG_FRAME_SIZE * 4);
+ memset(&rmsg, 0, I2O_OUTBOUND_MSG_FRAME_SIZE * 4);
// get user msg size in u32s
if (get_user(size, &user_msg[0])) {
rcode = -EFAULT;
@@ -914,7 +925,7 @@ static int i2o_cfg_passthru(unsigned lon
size = size >> 16;
size *= 4;
/* Copy in the user's I2O command */
- if (copy_from_user(msg, user_msg, size)) {
+ if (copy_from_user(rmsg, user_msg, size)) {
rcode = -EFAULT;
goto sg_list_cleanup;
}
@@ -922,7 +933,7 @@ static int i2o_cfg_passthru(unsigned lon
(size - sg_offset * 4) / sizeof(struct sg_simple_element);

// TODO 64bit fix
- sg = (struct sg_simple_element *)(msg + sg_offset);
+ sg = (struct sg_simple_element *)(rmsg + sg_offset);
for (j = 0; j < sg_count; j++) {
/* Copy out the SG list to user's buffer if necessary */
if (!
@@ -944,7 +955,7 @@ static int i2o_cfg_passthru(unsigned lon
}
}

- sg_list_cleanup:
+sg_list_cleanup:
/* Copy back the reply to user space */
if (reply_size) {
// we wrote our own values for context - now restore the user supplied ones
@@ -964,8 +975,11 @@ static int i2o_cfg_passthru(unsigned lon
for (i = 0; i < sg_index; i++)
kfree(sg_list[i]);

- cleanup:
+cleanup:
kfree(reply);
+ if (msg)
+out:
+ i2o_msg_nop(c, msg);
return rcode;
}
#endif