X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=mm%2Fmremap.c;h=457d34ef3bf2fd6000e74d778270d5a02a4bb6e9;hb=591ecdb8f276925251bb5f5fad7eb064979ecee1;hp=3708655378e9298b52ca34a204df48507aa954d2;hpb=ddcf6600b133697adbafd96e080818bdc0dfd028;p=firefly-linux-kernel-4.4.55.git

diff --git a/mm/mremap.c b/mm/mremap.c
index 3708655378e9..457d34ef3bf2 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -456,13 +456,14 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len,
 	unsigned long charged = 0;
 	bool locked = false;
 
-	down_write(&current->mm->mmap_sem);
-
 	if (flags & ~(MREMAP_FIXED | MREMAP_MAYMOVE))
-		goto out;
+		return ret;
+
+	if (flags & MREMAP_FIXED && !(flags & MREMAP_MAYMOVE))
+		return ret;
 
 	if (addr & ~PAGE_MASK)
-		goto out;
+		return ret;
 
 	old_len = PAGE_ALIGN(old_len);
 	new_len = PAGE_ALIGN(new_len);
@@ -473,12 +474,13 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len,
 	 * a zero new-len is nonsensical.
 	 */
 	if (!new_len)
-		goto out;
+		return ret;
+
+	down_write(&current->mm->mmap_sem);
 
 	if (flags & MREMAP_FIXED) {
-		if (flags & MREMAP_MAYMOVE)
-			ret = mremap_to(addr, old_len, new_addr, new_len,
-					&locked);
+		ret = mremap_to(addr, old_len, new_addr, new_len,
+				&locked);
 		goto out;
 	}