diff --git a/drivers/misc/qseecom.c b/drivers/misc/qseecom.c
index 5d35f4be132e..0c5dfee9b71a 100644
--- a/drivers/misc/qseecom.c
+++ b/drivers/misc/qseecom.c
@@ -3153,6 +3153,30 @@ static int qseecom_prepare_unload_app(struct qseecom_dev_handle *data)
 	pr_debug("prepare to unload app(%d)(%s), pending %d\n",
 		data->client.app_id, data->client.app_name,
 		data->client.unload_pending);
+
+	/* For keymaster we are not going to unload so no need to add it in
+	 * unload app pending list as soon as we identify release ion buffer
+	 * and return .
+	 */
+	if (!memcmp(data->client.app_name, "keymaste", strlen("keymaste"))) {
+		if (data->client.dmabuf) {
+			/* Each client will get same KM TA loaded handle but
+			 * will allocate separate shared buffer during
+			 * loading of TA, as client can't unload KM TA so we
+			 * will only free out shared buffer and return early
+			 * to avoid any ion buffer leak.
+			 */
+			qseecom_vaddr_unmap(data->client.sb_virt,
+				data->client.sgt, data->client.attach,
+				data->client.dmabuf);
+			MAKE_NULL(data->client.sgt,
+				data->client.attach, data->client.dmabuf);
+		}
+		__qseecom_free_tzbuf(&data->sglistinfo_shm);
+		data->released = true;
+		return 0;
+	}
+
 	if (data->client.unload_pending)
 		return 0;
 	entry = kzalloc(sizeof(*entry), GFP_KERNEL);
diff --git a/drivers/platform/msm/ipa/ipa_v3/ipahal/ipahal_fltrt_i.h b/drivers/platform/msm/ipa/ipa_v3/ipahal/ipahal_fltrt_i.h
index 283786236a07..0200541c2764 100644
--- a/drivers/platform/msm/ipa/ipa_v3/ipahal/ipahal_fltrt_i.h
+++ b/drivers/platform/msm/ipa/ipa_v3/ipahal/ipahal_fltrt_i.h
@@ -44,7 +44,7 @@ enum ipa_fltrt_equations {
 #define IPA3_0_HW_TBL_ADDR_MASK (127)
 #define IPA3_0_HW_RULE_BUF_SIZE (256)
 #define IPA3_0_HW_RULE_START_ALIGNMENT (7)
-#define IPA3_0_HW_RULE_PREFETCH_BUF_SIZE (128)
+#define IPA3_0_HW_RULE_PREFETCH_BUF_SIZE (256)
 
 
 /*
diff --git a/fs/exec.c b/fs/exec.c
index 17d7f8a66167..82d552981719 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1805,6 +1805,9 @@ static int __do_execve_file(int fd, struct filename *filename,
 		goto out_unmark;
 
 	bprm->argc = count(argv, MAX_ARG_STRINGS);
+	if (bprm->argc == 0)
+		pr_warn_once("process '%s' launched '%s' with NULL argv: empty string added\n",
+			     current->comm, bprm->filename);
 	if ((retval = bprm->argc) < 0)
 		goto out;
 
@@ -1829,6 +1832,20 @@ static int __do_execve_file(int fd, struct filename *filename,
 	if (retval < 0)
 		goto out;
 
+	/*
+	 * When argv is empty, add an empty string ("") as argv[0] to
+	 * ensure confused userspace programs that start processing
+	 * from argv[1] won't end up walking envp. See also
+	 * bprm_stack_limits().
+	 */
+	if (bprm->argc == 0) {
+		const char *argv[] = { "", NULL };
+		retval = copy_strings_kernel(1, argv, bprm);
+		if (retval < 0)
+			goto out;
+		bprm->argc = 1;
+	}
+
 	retval = exec_binprm(bprm);
 	if (retval < 0)
 		goto out;
diff --git a/mm/mmap.c b/mm/mmap.c
index b23744449d8e..94509df0cc09 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -3178,10 +3178,9 @@ void exit_mmap(struct mm_struct *mm)
 		(void)__oom_reap_task_mm(mm);
 
 		set_bit(MMF_OOM_SKIP, &mm->flags);
-		down_write(&mm->mmap_sem);
-		up_write(&mm->mmap_sem);
 	}
 
+	down_write(&mm->mmap_sem);
 	if (mm->locked_vm) {
 		vma = mm->mmap;
 		while (vma) {
@@ -3194,8 +3193,11 @@ void exit_mmap(struct mm_struct *mm)
 	arch_exit_mmap(mm);
 
 	vma = mm->mmap;
-	if (!vma)	/* Can happen if dup_mmap() received an OOM */
+	if (!vma) {
+		/* Can happen if dup_mmap() received an OOM */
+		up_write(&mm->mmap_sem);;
 		return;
+	}
 
 	lru_add_drain();
 	flush_cache_mm(mm);
@@ -3206,16 +3208,14 @@ void exit_mmap(struct mm_struct *mm)
 	free_pgtables(&tlb, vma, FIRST_USER_ADDRESS, USER_PGTABLES_CEILING);
 	tlb_finish_mmu(&tlb, 0, -1);
 
-	/*
-	 * Walk the list again, actually closing and freeing it,
-	 * with preemption enabled, without holding any MM locks.
-	 */
+	/* Walk the list again, actually closing and freeing it. */
 	while (vma) {
 		if (vma->vm_flags & VM_ACCOUNT)
 			nr_accounted += vma_pages(vma);
 		vma = remove_vma(vma);
 		cond_resched();
 	}
+	up_write(&mm->mmap_sem);
 	vm_unacct_memory(nr_accounted);
 }