iwlwifi: mvm: make debugfs write() operations write up to count bytes

Some debugfs write() operations of the MVM Firmware will ignore the
count argument, and will copy more bytes than what was specified.
Fix this by getting the right count of bytes.

This will honor restrictions put on the number of bytes to write and
avoid strcmp() calls on garbage data.

Signed-off-by: Djalal Harouni <tixxdz@opendz.org>
Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/drivers/net/wireless/iwlwifi/mvm/debugfs.c b/drivers/net/wireless/iwlwifi/mvm/debugfs.c
index 1e9e6f384a829471b13ebdd884e15e942dfd0273..26c53b37007e702a88d50a67dc1e7eaaa7947c60 100644 (file)
--- a/drivers/net/wireless/iwlwifi/mvm/debugfs.c
+++ b/drivers/net/wireless/iwlwifi/mvm/debugfs.c
@@ -257,7 +257,8 @@ static ssize_t iwl_dbgfs_power_down_allow_write(struct file *file,
        if (!mvm->ucode_loaded)
                return -EIO;
 
-       if (copy_from_user(buf, user_buf, sizeof(buf)))
+       count = min_t(size_t, count, sizeof(buf) - 1);
+       if (copy_from_user(buf, user_buf, count))
                return -EFAULT;
 
        if (sscanf(buf, "%d", &allow) != 1)
@@ -281,7 +282,8 @@ static ssize_t iwl_dbgfs_power_down_d3_allow_write(struct file *file,
        char buf[8] = {};
        int allow;
 
-       if (copy_from_user(buf, user_buf, sizeof(buf)))
+       count = min_t(size_t, count, sizeof(buf) - 1);
+       if (copy_from_user(buf, user_buf, count))
                return -EFAULT;
 
        if (sscanf(buf, "%d", &allow) != 1)
@@ -371,7 +373,8 @@ static ssize_t iwl_dbgfs_pm_params_write(struct file *file,
        int val;
        int ret;
 
-       if (copy_from_user(buf, user_buf, sizeof(buf)))
+       count = min_t(size_t, count, sizeof(buf) - 1);
+       if (copy_from_user(buf, user_buf, count))
                return -EFAULT;
 
        if (!strncmp("keep_alive=", buf, 11)) {
@@ -1021,7 +1024,8 @@ static ssize_t iwl_dbgfs_d3_sram_write(struct file *file,
        char buf[8] = {};
        int store;
 
-       if (copy_from_user(buf, user_buf, sizeof(buf)))
+       count = min_t(size_t, count, sizeof(buf) - 1);
+       if (copy_from_user(buf, user_buf, count))
                return -EFAULT;
 
        if (sscanf(buf, "%d", &store) != 1)