ARC: uaccess: get_user to zero out dest in cause of fault

[firefly-linux-kernel-4.4.55.git] / arch / arc / include / asm / uaccess.h

diff --git a/arch/arc/include/asm/uaccess.h b/arch/arc/include/asm/uaccess.h
index d1da6032b715a7fea35d71fcedeeeb8cdfe590e4..d4d8df706efa738ae115ddf68b37dad2d8d271c9 100644 (file)
--- a/arch/arc/include/asm/uaccess.h
+++ b/arch/arc/include/asm/uaccess.h
@@ -83,7 +83,10 @@
        "2:     ;nop\n"                         \
        "       .section .fixup, \"ax\"\n"      \
        "       .align 4\n"                     \
-       "3:     mov %0, %3\n"                   \
+       "3:     # return -EFAULT\n"             \
+       "       mov %0, %3\n"                   \
+       "       # zero out dst ptr\n"           \
+       "       mov %1,  0\n"                   \
        "       j   2b\n"                       \
        "       .previous\n"                    \
        "       .section __ex_table, \"a\"\n"   \
@@ -101,7 +104,11 @@
        "2:     ;nop\n"                         \
        "       .section .fixup, \"ax\"\n"      \
        "       .align 4\n"                     \
-       "3:     mov %0, %3\n"                   \
+       "3:     # return -EFAULT\n"             \
+       "       mov %0, %3\n"                   \
+       "       # zero out dst ptr\n"           \
+       "       mov %1,  0\n"                   \
+       "       mov %R1, 0\n"                   \
        "       j   2b\n"                       \
        "       .previous\n"                    \
        "       .section __ex_table, \"a\"\n"   \