dmaengine: idxd: remove trailing white space on input str for wq name

mainline inclusion
from mainline-v5.19
commit 81f5eb2b
category: feature
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I596WO
CVE: NA

Intel-SIG: commit 81f5eb2b dmaengine: idxd: remove trailing white space on input str for wq name.
Incremental backporting patches for DSA/IAA on Intel Xeon platform.

--------------------------------

Add string processing with strim() in order to remove trailing white spaces
that may be input by user for the wq->name.
Signed-off-by: NDave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/164789525123.2799661.13795829125221129132.stgit@djiang5-desk3.ch.intel.comSigned-off-by: NVinod Koul <vkoul@kernel.org>
Signed-off-by: NXiaochen Shen <xiaochen.shen@intel.com>

drivers/dma/idxd/sysfs.c

@@ -832,6 +832,7 @@ static ssize_t wq_name_store(struct device *dev,
 			     size_t count)
 {
 	struct idxd_wq *wq = confdev_to_wq(dev);
+	char *input, *pos;
 
 	if (wq->state != IDXD_WQ_DISABLED)
 		return -EPERM;
@@ -846,9 +847,14 @@ static ssize_t wq_name_store(struct device *dev,
 	if (wq->type == IDXD_WQT_KERNEL && device_pasid_enabled(wq->idxd))
 		return -EOPNOTSUPP;
 
+	input = kstrndup(buf, count, GFP_KERNEL);
+	if (!input)
+		return -ENOMEM;
+
+	pos = strim(input);
 	memset(wq->name, 0, WQ_NAME_SIZE + 1);
-	strncpy(wq->name, buf, WQ_NAME_SIZE);
-	strreplace(wq->name, '\n', '\0');
+	sprintf(wq->name, "%s", pos);
+	kfree(input);
 	return count;
 }