From 7380c153b97bfa38a0dfa9cccc71062f6d6bd6f4 Mon Sep 17 00:00:00 2001 From: Rhed Jao Date: Fri, 30 Jul 2021 15:52:05 +0800 Subject: [PATCH] DO NOT MERGE Apply a maximum char count to the load label api The system is overwhelmed by an enormous label string returned by the load label api. This cl truncates the label string if it exceeds the maximum safe length. Also update the max safe label length to 1000 characters, which is enough. Bug: 67013844 Test: atest PackageManagerTest Change-Id: Ia4d768cc93a47cfb8b6f7c4b6dc73abd801809bd Merged-in: Ia4d768cc93a47cfb8b6f7c4b6dc73abd801809bd --- .../android/content/pm/PackageItemInfo.java | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/core/java/android/content/pm/PackageItemInfo.java b/core/java/android/content/pm/PackageItemInfo.java index 84b779466dbf9..63a158b0bf40d 100644 --- a/core/java/android/content/pm/PackageItemInfo.java +++ b/core/java/android/content/pm/PackageItemInfo.java @@ -43,7 +43,7 @@ import java.util.Comparator; public class PackageItemInfo { private static final float MAX_LABEL_SIZE_PX = 500f; /** The maximum length of a safe label, in characters */ - private static final int MAX_SAFE_LABEL_LENGTH = 50000; + private static final int MAX_SAFE_LABEL_LENGTH = 1000; /** * Public name of this item. From the "android:name" attribute. @@ -131,6 +131,12 @@ public class PackageItemInfo { * item does not have a label, its name is returned. */ public CharSequence loadLabel(PackageManager pm) { + // Trims the label string to the MAX_SAFE_LABEL_LENGTH. This is to prevent that the + // system is overwhelmed by an enormous string returned by the application. + return trimToSize(loadUnsafeLabel(pm), MAX_SAFE_LABEL_LENGTH); + } + + private CharSequence loadUnsafeLabel(PackageManager pm) { if (nonLocalizedLabel != null) { return nonLocalizedLabel; } @@ -146,6 +152,15 @@ public class PackageItemInfo { return packageName; } + private CharSequence trimToSize(CharSequence label, int size) { + if (TextUtils.isEmpty(label) || label.length() <= size) return label; + if (Character.isHighSurrogate(label.charAt(size - 1)) + && Character.isLowSurrogate(label.charAt(size))) { + size = size - 1; + } + return label.subSequence(0, size); + } + /** * Same as {@link #loadLabel(PackageManager)} with the addition that * the returned label is safe for being presented in the UI since it