[libc] Fix the addr=NULL issue in mmap.

BernardXiong · BernardXiong · commit 97560dd8e208 · 2019-01-21T17:19:07.000+08:00
diff --git a/components/libc/mmap/posix_mmap.c b/components/libc/mmap/posix_mmap.c
@@ -35,7 +35,7 @@ void *mmap(void *addr, size_t length, int prot, int flags,
         cur = lseek(fd, 0, SEEK_SET);
 
         lseek(fd, offset, SEEK_SET);
-        read_bytes = read(fd, addr, length);
+        read_bytes = read(fd, mem, length);
         if (read_bytes != length)
         {
             if (addr == RT_NULL)

Original file line number	Diff line number	Diff line change
`@@ -35,7 +35,7 @@ void mmap(void addr, size_t length, int prot, int flags,`
`35`	`35`	`cur = lseek(fd, 0, SEEK_SET);`
`36`	`36`
`37`	`37`	`lseek(fd, offset, SEEK_SET);`
`38`		`- read_bytes = read(fd, addr, length);`
	`38`	`+ read_bytes = read(fd, mem, length);`
`39`	`39`	`if (read_bytes != length)`
`40`	`40`	`{`
`41`	`41`	`if (addr == RT_NULL)`