--- a/Cargo.lock
+++ b/Cargo.lock
@@ -625,31 +625,31 @@ name = "ena"
 version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "encoding_c"
 version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "encoding_rs 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "encoding_rs 0.8.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "encoding_glue"
 version = "0.1.0"
 dependencies = [
- "encoding_rs 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "encoding_rs 0.8.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "nserror 0.1.0",
  "nsstring 0.1.0",
 ]
 
 [[package]]
 name = "encoding_rs"
-version = "0.8.3"
+version = "0.8.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "simd 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "env_logger"
@@ -2572,17 +2572,17 @@ dependencies = [
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 "checksum docopt 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)" = "d8acd393692c503b168471874953a2531df0e9ab77d0b6bbc582395743300a4a"
 "checksum dtoa 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "09c3753c3db574d215cba4ea76018483895d7bff25a31b49ba45db21c48e50ab"
 "checksum dtoa-short 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "068d4026697c1a18f0b0bb8cfcad1b0c151b90d8edb9bf4c235ad68128920d1d"
 "checksum dwrote 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "b26e30aaa6bf31ec830db15fec14ed04f0f2ecfcc486ecfce88c55d3389b237f"
 "checksum either 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "18785c1ba806c258137c937e44ada9ee7e69a37e3c72077542cd2f069d78562a"
 "checksum ena 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "cabe5a5078ac8c506d3e4430763b1ba9b609b1286913e7d08e581d1c2de9b7e5"
 "checksum encoding_c 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "769ecb8b33323998e482b218c0d13cd64c267609023b4b7ec3ee740714c318ee"
-"checksum encoding_rs 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)" = "0122c98564237c64fc6cace6abdfdb2438e0082aa7456ee86ccc04f7c3be1d5e"
+"checksum encoding_rs 0.8.4 (registry+https://github.com/rust-lang/crates.io-index)" = "88a1b66a0d28af4b03a8c8278c6dcb90e6e600d89c14500a9e7a02e64b9ee3ac"
 "checksum env_logger 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)" = "0561146661ae44c579e993456bc76d11ce1e0c7d745e57b2fa7146b6e49fa2ad"
 "checksum error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ff511d5dc435d703f4971bc399647c9bc38e20cb41452e3b9feb4765419ed3f3"
 "checksum euclid 0.17.3 (registry+https://github.com/rust-lang/crates.io-index)" = "c95fd0d455f114291a3109286bd387bd423770058474a2d3f38b712cd661df60"
 "checksum fixedbitset 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "85cb8fec437468d86dc7c83ca7cfc933341d561873275f22dd5eedefa63a6478"
 "checksum flate2 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "9fac2277e84e5e858483756647a9d0aa8d9a2b7cba517fd84325a0aaa69a0909"
 "checksum fnv 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)" = "6cc484842f1e2884faf56f529f960cc12ad8c71ce96cc7abba0a067c98fee344"
 "checksum foreign-types 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5ebc04f19019fff1f2d627b5581574ead502f80c48c88900575a46e0840fe5d0"
 "checksum freetype 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b659e75b7a7338fe75afd7f909fc2b71937845cffb6ebe54ba2e50f13d8e903d"

--- a/third_party/rust/encoding_rs/.cargo-checksum.json
+++ b/third_party/rust/encoding_rs/.cargo-checksum.json
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\ No newline at end of file
+{"files":{".travis.yml":"262b9925451db996c31e4bb8bb6bbdb36c3f6009f407db5ed4b0ed25cd72d8c8","CONTRIBUTING.md":"0d4bfb1068c2b2f32b7bc7833662dfff628d86b0f31068266027c719fb727360","COPYRIGHT":"20d4fff11cca11529df3f02096fbe8ffe350219cdb07cdedea34e6a762866da5","Cargo.toml":"e950a52d578e21c59f56adb406310e7593e6126b9f02e5d376af7627691a7fd6","Ideas.md":"7fbeddb0f8ba7b233673ee705997adc2fddb1636a17fe662532b35ef2810a51d","LICENSE-APACHE":"cfc7749b96f63bd31c3c42b5c471bf756814053e847c10f3eb003417bc523d30","LICENSE-MIT":"74aa8b6d04c36bb640ee81187a3f24a2fa94e36d4c1d4f2ca164c3784ae87a83","README.md":"87aa2c116f2de0ec2c40e2d4aae01bd15e314e1c8f197ba1e671edd763bd236f","doc/Big5.txt":"f73a2edc5cb6c2d140ba6e07f4542e1c4a234950378acde1df93480f0ca0be0b","doc/EUC-JP.txt":"ee2818b907d0137f40a9ab9fd525fc700a44dbdddb6cf0c157a656566bae4bf1","doc/EUC-KR.txt":"71d9e2ccf3b124e8bdfb433c8cf2773fd878077038d0cec3c7237a50f4a78a30","doc/GBK.txt":"c1b522b5a799884e5001da661f42c5a8f4d0acb9ef1d74b206f22b5f65365606","doc/IBM866.txt":"a5a433e804d0f83af785015179fbc1d9b0eaf1f7960efcd04093e136b51fbd0e","doc/ISO-2022-JP.txt":"af86684f5a8f0e2868d7b2c292860140c3d2e5527530ca091f1b28198e8e2fe6","doc/ISO-8859-10.txt":"6d3949ad7c81ca176895101ed81a1db7df1060d64e262880b94bd31bb344ab4d","doc/ISO-8859-13.txt":"3951dd89cf93f7729148091683cf8511f4529388b7dc8dcd0d62eaed55be93fa","doc/ISO-8859-14.txt":"3d330784a0374fd255a38b47949675cc7168c800530534b0a01cac6edc623adc","doc/ISO-8859-15.txt":"24b1084aab5127a85aab99153f86e24694d0a3615f53b5ce23683f97cf66c47a","doc/ISO-8859-16.txt":"ce0272559b92ba76d7a7e476f6424ae4a5cc72e75b183611b08392e44add4d25","doc/ISO-8859-2.txt":"18ceff88c13d1b5ba455a3919b1e3de489045c4c3d2dd7e8527c125c75d54aad","doc/ISO-8859-3.txt":"21798404c68f4f5db59223362f24999da96968c0628427321fccce7d2849a130","doc/ISO-8859-4.txt":"d27f6520c6c5bfbcc19176b71d081cdb3bccde1622bb3e420d5680e812632d53","doc/ISO-8859-5.txt":"a10ec8d6ea7a78ad15da7275f6cb1a3365118527e28f9af6d0d5830501303f3a","doc/ISO-8859-6.txt":"ccda8a2efc96115336bdd77776637b9712425e44fbcf745353b9057fbef144e7","doc/ISO-8859-7.txt":"17900fa1f27a445958f0a77d7d9056be375a6bd7ee4492aa680c7c1500bab85e","doc/ISO-8859-8-I.txt":"8357555646d54265a9b9ffa3e68b08d132312f1561c60108ff9b8b1167b6ecf2","doc/ISO-8859-8.txt":"72cd6f3afb7b4a9c16a66a362473315770b7755d72c86c870e52fc3eba86c8af","doc/KOI8-R.txt":"839cf19a38da994488004ed7814b1f6151640156a9a2af02bf2efca745fb5966","doc/KOI8-U.txt":"0cc76624ed1f024183e2298b7e019957da2c70c8ca06e0fc4e6f353f50a5054f","doc/Shift_JIS.txt":"34c49141818cb9ddbcf59cc858f78a79be8ad148d563f26415108ae1f148443f","doc/UTF-16BE.txt":"e2e280d8acbaa6d2a6b3569d60e17500a285f2baa0df3363dd85537cd5a1ef8f","doc/UTF-16LE.txt":"70bdc170e3fc5298ba68f10125fb5eeb8b077036cc96bb4416c4de396f6d76c1","doc/UTF-8.txt":"ea7bae742e613010ced002cf4b601a737d2203fad65e115611451bc4428f548a","doc/gb18030.txt":"dc71378a8f07a2d8659f69ee81fb8791fef56ba86f124b429978285237bb4a7b","doc/macintosh.txt":"57491e53866711b4672d9b9ff35380b9dac9e0d8e3d6c20bdd6140603687c023","doc/replacement.txt":"4b6c3bbd7999d9d4108a281594bd02d13607e334a95465afff8c2c08d395f0e4","doc/windows-1250.txt":"61296bb6a21cdab602300d32ecfba434cb82de5ac3bc88d58710d2f125e28d39","doc/windows-1251.txt":"7deea1c61dea1485c8ff02db2c7d578db7a9aab63ab1cfd02ec04b515864689e","doc/windows-1252.txt":"933ef3bdddfce5ee132b9f1a1aa8b47423d2587bbe475b19028d0a6d38e180b6","doc/windows-1253.txt":"1a38748b88e99071a5c7b3d5456ead4caedeabab50d50d658be105bc113714de","doc/windows-1254.txt":"f8372f86c6f8d642563cd6ddc025260553292a39423df1683a98670bd7bf2b47","doc/windows-1255.txt":"4e5852494730054e2da258a74e1b9d780abbcdd8ce22ebc218ca2efe9e90493d","doc/windows-1256.txt":"c0879c5172abedead302a406e8f60d9cd9598694a0ffa4fd288ffe4fef7b8ea1","doc/windows-1257.txt":"c28a0c9f964fcb2b46d21f537c402446501a2800670481d6abf9fd9e9018d523","doc/windows-1258.txt":"5019ae4d61805c79aacbf17c93793342dbb098d65a1837783bc3e2c6d6a23602","doc/windows-874.txt":"4ef0e4501c5feba8b17aee1818602ed44b36ca8475db771ce2fc16d392cabecc","doc/x-mac-cyrillic.txt":"58be154d8a888ca3d484b83b44f749823ef339ab27f14d90ca9a856f5050a8bd","doc/x-user-defined.txt":"f9cd07c4321bf5cfb0be4bdddd251072999b04a6cf7a6f5bc63709a84e2c1ffc","generate-encoding-data.py":"bbe134cc013a17c32bd51e868a2ee4f2c3e2205e40afb9fc60f98fa9758961b8","rustfmt.toml":"85c1a3b4382fd89e991cbb81b70fb52780472edc064c963943cdaaa56e0a2030","src/ascii.rs":"a9cf02c992229952976761655c044be23675a278de1a6186d8baaf66879c4f4a","src/big5.rs":"659ddb66f82142468774715cd9ecdc8356005fec9d91e46d54ae2280a88adb4b","src/data.rs":"18793e23f98d9aba1ed2858c43b2103c9c05a8571429b2128510c68d05ba8cb6","src/euc_jp.rs":"b178172274af1a6be38d388e5a2468e7140e9facf63d2f679f4ed77c3fc20a92","src/euc_kr.rs":"e27bd9c4e2172bb02004dd2a1fcbe02118415a1aec6a90b5632c9eac6f12ba7d","src/gb18030.rs":"752869f47ad0cad02ad3ccb6fde3eb277fa528e10e3d9432a90563db610d9dc2","src/handles.rs":"0598439bf66bd26699cba7e9e2fec001f8c57f3a510578fc3cc118ddc36d6831","src/iso_2022_jp.rs":"d904a92d49fc5878e6cb82a21185051c801489cf2800db8f37269965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\ No newline at end of file

--- a/third_party/rust/encoding_rs/Cargo.toml
+++ b/third_party/rust/encoding_rs/Cargo.toml
@@ -7,17 +7,17 @@
 #
 # If you believe there's an error in this file please file an
 # issue against the rust-lang/cargo repository. If you're
 # editing this file be aware that the upstream Cargo.toml
 # will likely look very different (and much more reasonable)
 
 [package]
 name = "encoding_rs"
-version = "0.8.3"
+version = "0.8.4"
 authors = ["Henri Sivonen <hsivonen@hsivonen.fi>"]
 description = "A Gecko-oriented implementation of the Encoding Standard"
 homepage = "https://docs.rs/encoding_rs/"
 documentation = "https://docs.rs/encoding_rs/"
 readme = "README.md"
 keywords = ["encoding", "web", "unicode", "charset"]
 categories = ["text-processing", "encoding", "web-programming", "email"]
 license = "MIT/Apache-2.0"

--- a/third_party/rust/encoding_rs/README.md
+++ b/third_party/rust/encoding_rs/README.md
@@ -232,16 +232,21 @@ used in Firefox.
 - [x] Add SIMD acceleration for Aarch64.
 - [x] Investigate the use of NEON on 32-bit ARM.
 - [ ] Investigate Björn Höhrmann's lookup table acceleration for UTF-8 as
       adapted to Rust in rust-encoding.
 - [ ] Add actually fast CJK encode options.
 
 ## Release Notes
 
+### 0.8.4
+
+* Fix SSE2-specific, `simd-accel`-specific memory corruption introduced in
+  version 0.8.1 in conversions between UTF-16 and Latin1 in the `mem` module.
+
 ### 0.8.3
 
 * Removed an `#[inline(never)]` annotation that was not meant for release.
 
 ### 0.8.2
 
 * Made non-ASCII UTF-16 to UTF-8 encode faster by manually omitting bound
   checks and manually adding branch prediction annotations.

--- a/third_party/rust/encoding_rs/src/ascii.rs
+++ b/third_party/rust/encoding_rs/src/ascii.rs
@@ -488,17 +488,17 @@ macro_rules! latin1_simd_check_align_unr
                 let mut until_alignment = ((SIMD_STRIDE_SIZE - ((src as usize) & SIMD_ALIGNMENT_MASK))
                     & SIMD_ALIGNMENT_MASK) / unit_size;
                 while until_alignment != 0 {
                     *(dst.offset(offset as isize)) = *(src.offset(offset as isize)) as $dst_unit;
                     offset += 1;
                     until_alignment -= 1;
                 }
                 let len_minus_stride = len - SIMD_STRIDE_SIZE;
-                if SIMD_STRIDE_SIZE * 2 <= len {
+                if offset + SIMD_STRIDE_SIZE * 2 <= len {
                     let len_minus_stride_times_two = len_minus_stride - SIMD_STRIDE_SIZE;
                     if (dst.offset(offset as isize) as usize) & SIMD_ALIGNMENT_MASK == 0 {
                         loop {
                             $stride_both_aligned(
                                 src.offset(offset as isize),
                                 dst.offset(offset as isize),
                             );
                             offset += SIMD_STRIDE_SIZE;

--- a/third_party/rust/encoding_rs/src/lib.rs
+++ b/third_party/rust/encoding_rs/src/lib.rs
@@ -3,17 +3,17 @@
 //
 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
 // https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
 // <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
 #![cfg_attr(feature = "cargo-clippy", allow(doc_markdown, inline_always, new_ret_no_self))]
-#![doc(html_root_url = "https://docs.rs/encoding_rs/0.8.3")]
+#![doc(html_root_url = "https://docs.rs/encoding_rs/0.8.4")]
 
 //! encoding_rs is a Gecko-oriented Free Software / Open Source implementation
 //! of the [Encoding Standard](https://encoding.spec.whatwg.org/) in Rust.
 //! Gecko-oriented means that converting to and from UTF-16 is supported in
 //! addition to converting to and from UTF-8, that the performance and
 //! streamability goals are browser-oriented, and that FFI-friendliness is a
 //! goal.
 //!