From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Sergio Gonzalez Martin <sergiog@microsoft.com>
Date: Thu, 23 Jul 2026 00:00:00 +0000
Subject: [PATCH] profile: Accept zeroed ICC profile versions

Some otherwise valid ICC profiles found in the wild have zeroed profile
version bytes. skcms accepts those profiles and Chromium previously relied on
that behavior. Treat fully zeroed version bytes as v2.0 for compatibility
while still rejecting other v0.x values and ICC MAX / future major versions.

diff --git a/third_party/rust/chromium_crates_io/vendor/moxcms-v0_8/src/profile.rs b/third_party/rust/chromium_crates_io/vendor/moxcms-v0_8/src/profile.rs
index ffae667b6af93..5f361cdc17294 100644
--- a/third_party/rust/chromium_crates_io/vendor/moxcms-v0_8/src/profile.rs
+++ b/third_party/rust/chromium_crates_io/vendor/moxcms-v0_8/src/profile.rs
@@ -90,7 +90,10 @@ impl TryFrom<u32> for ProfileVersion {
     type Error = CmsError;
     fn try_from(value: u32) -> Result<Self, Self::Error> {
         // First try exact match for known versions
         match value {
+            // Some otherwise valid ICC profiles have zeroed version bytes.
+            // skcms accepts them; treat them as v2.0 for compatibility.
+            0x00000000 => return Ok(ProfileVersion::V2_0),
             0x02000000 => return Ok(ProfileVersion::V2_0),
             0x02100000 => return Ok(ProfileVersion::V2_1),
             0x02200000 => return Ok(ProfileVersion::V2_2),
@@ -109,11 +112,12 @@ impl TryFrom<u32> for ProfileVersion {
         let minor = (value >> 20) & 0x0F;
 
         // Accept profiles with patch versions (e.g., v2.0.2, v3.4, v4.2.9)
-        // but reject invalid versions (v0.x) and unsupported versions (v5.x+ / ICC MAX)
+        // but reject invalid versions (v0.x) and unsupported versions
+        // (v5.x+ / ICC MAX).
         match major {
             0 => {
-                // Version 0.x is invalid - reject
-                Err(CmsError::InvalidProfile)
+                // Non-zero v0.x versions are invalid.
+                Err(CmsError::InvalidProfile)
             }
             2 => {
                 // v2.x - map to the appropriate v2 minor version or highest known
@@ -1499,7 +1503,11 @@ mod tests {
 
     #[test]
     fn test_profile_version_parsing_patch_versions() {
-        // Patch versions found in real ICC profiles should be accepted
+        // Completely zeroed version bytes found in otherwise valid profiles
+        // should be accepted and treated as v2.0 for compatibility.
+        assert_eq!(ProfileVersion::try_from(0x00000000).unwrap(), ProfileVersion::V2_0);
+
+        // Patch versions found in real ICC profiles should be accepted.
 
         // v2.0.2 (SM245B.icc) - minor bugfix version
         assert!(
@@ -1522,7 +1531,13 @@ mod tests {
 
     #[test]
     fn test_profile_version_parsing_rejected() {
         // Invalid and unsupported versions should be rejected
+
+        // Non-zero v0.x versions should still be rejected.
+        assert!(
+            ProfileVersion::try_from(0x00100000).is_err(),
+            "v0.1 should be rejected"
+        );
 
         // v5.0 (iccMAX) - reject because it has different white point requirements
         assert!(
-- 
2.50.1