Zlib patch: prevent uninitialized use of state->check

No need to call the Adler32 checksum function, just set the
struct field to the expected value.

Upstream bug: madler/zlib#245

Bug: chromium:697481
Change-Id: Ib972cc2507c8e7ca0b0b48464db33880ef960fb8
Reviewed-on: https://chromium-review.googlesource.com/644505
Commit-Queue: Adenilson Cavalcanti <cavalcantii@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#498998}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: f4b484415281f09d0bbc0880f5d41dbdde96c209

1 files changed, 2 insertions, 1 deletions

diff --git a/inflate.c b/inflate.c
index 69b769a..cc38b98 100644
--- a/inflate.c
+++ b/inflate.c
@@ -228,7 +228,8 @@ int stream_size;
     state->strm = strm;
     state->window = Z_NULL;
     state->mode = HEAD;     /* to pass state test in inflateReset2() */
-    state->check = adler32(0L, Z_NULL, 0);
+    /* 1L is the result of adler32() on zero length data */
+    state->check = 1L;
     ret = inflateReset2(strm, windowBits);
     if (ret != Z_OK) {
         ZFREE(strm, state);