Code: store_pool_error(png_store *ps, png_const_structp pp, PNG_CONST char *msg)
 {
    if (pp != NULL)
       png_error(pp, msg);

 /* Else we have to do it ourselves.  png_error eventually calls store_log,
    * above.  store_log accepts a NULL png_structp - it just changes what gets
    * output by store_message.
    */
   store_log(ps, pp, msg, 1 /* error */);
}

Vulnerability Type: +Priv 
CWE ID: 
Summary: Unspecified vulnerability in libpng before 1.6.20, as used in Android 4.x before 4.4.4, 5.0.x before 5.0.2, 5.1.x before 5.1.1, and 6.x before 2016-07-01, allows attackers to gain privileges via a crafted application, as demonstrated by obtaining Signature or SignatureOrSystem access, aka internal bug 23265085.
Commit Message: DO NOT MERGE Update libpng to 1.6.20

BUG:23265085
Change-Id: I85199805636d771f3597b691b63bc0bf46084833
(cherry picked from commit bbe98b40cda082024b669fa508931042eed18f82)
