Fix elf_cvt_gunhash if dest and src are same.

Upstream-status: Pending

The 'dest' and 'src' can be same, we need to save the value of src32[2]
before swaping it.

Signed-off-by: Baoshan Pang <BaoShan.Pang@windriver.com>
diff --git a/libelf/gnuhash_xlate.h b/libelf/gnuhash_xlate.h
index 6faf113..04d9ca1 100644
--- a/libelf/gnuhash_xlate.h
+++ b/libelf/gnuhash_xlate.h
@@ -40,6 +40,7 @@ elf_cvt_gnuhash (void *dest, const void *src, size_t len, int encode)
      words.  We must detangle them here.   */
   Elf32_Word *dest32 = dest;
   const Elf32_Word *src32 = src;
+  Elf32_Word save_src32_2 = src32[2]; // dest could be equal to src
 
   /* First four control words, 32 bits.  */
   for (unsigned int cnt = 0; cnt < 4; ++cnt)
@@ -50,7 +51,7 @@ elf_cvt_gnuhash (void *dest, const void *src, size_t len, int encode)
       len -= 4;
     }
 
-  Elf32_Word bitmask_words = encode ? src32[2] : dest32[2];
+  Elf32_Word bitmask_words = encode ? save_src32_2 : dest32[2];
 
   /* Now the 64 bit words.  */
   Elf64_Xword *dest64 = (Elf64_Xword *) &dest32[4];