1 files changed, 8 insertions, 2 deletions

diff --git a/arch/powerpc/lib/code-patching.c b/arch/powerpc/lib/code-patching.c
index 638dde313cbc..430f4c15d786 100644
--- a/arch/powerpc/lib/code-patching.c
+++ b/arch/powerpc/lib/code-patching.c
@@ -26,12 +26,18 @@ unsigned int create_branch(const unsigned int *addr,
                            unsigned long target, int flags)
 {
         unsigned int instruction;
+        long offset;
 
+        offset = target;
         if (! (flags & BRANCH_ABSOLUTE))
-                target = target - (unsigned long)addr;
+                offset = offset - (unsigned long)addr;
+
+        /* Check we can represent the target in the instruction format */
+        if (offset < -0x2000000 || offset > 0x1fffffc || offset & 0x3)
+                return 0;
 
         /* Mask out the flags and target, so they don't step on each other. */
-        instruction = 0x48000000 | (flags & 0x3) | (target & 0x03FFFFFC);
+        instruction = 0x48000000 | (flags & 0x3) | (offset & 0x03FFFFFC);
 
         return instruction;
 }