+ lib-zlib-fix-dfltcc-not-flushing-eobs-when-creating-raw-streams.patch added to mm-nonmm-unstable branch

+ lib-zlib-fix-dfltcc-not-flushing-eobs-when-creating-raw-streams.patch added to mm-nonmm-unstable branch

[Andrew Morton]

The patch titled
     Subject: lib/zlib: fix DFLTCC not flushing EOBS when creating raw streams
has been added to the -mm mm-nonmm-unstable branch.  Its filename is
     lib-zlib-fix-dfltcc-not-flushing-eobs-when-creating-raw-streams.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/lib-zlib-fix-dfltcc-not-flushing-eobs-when-creating-raw-streams.patch

This patch will later appear in the mm-nonmm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Mikhail Zaslonko <zaslonko@linux.ibm.com>
Subject: lib/zlib: fix DFLTCC not flushing EOBS when creating raw streams
Date: Thu, 26 Jan 2023 14:14:23 +0100

This commit is based on:
  https://github.com/zlib-ng/zlib-ng/commit/ca99a88

Link: https://lkml.kernel.org/r/20230126131428.1222214-4-zaslonko@linux.ibm.com
Signed-off-by: Mikhail Zaslonko <zaslonko@linux.ibm.com>
Acked-by: Ilya Leoshkevich <iii@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 lib/zlib_deflate/deflate.c |   19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

--- a/lib/zlib_deflate/deflate.c~lib-zlib-fix-dfltcc-not-flushing-eobs-when-creating-raw-streams
+++ a/lib/zlib_deflate/deflate.c
@@ -451,17 +451,24 @@ int zlib_deflate(
     Assert(strm->avail_out > 0, "bug2");
 
     if (flush != Z_FINISH) return Z_OK;
-    if (s->noheader) return Z_STREAM_END;
 
-    /* Write the zlib trailer (adler32) */
-    putShortMSB(s, (uInt)(strm->adler >> 16));
-    putShortMSB(s, (uInt)(strm->adler & 0xffff));
+    if (!s->noheader) {
+	/* Write zlib trailer (adler32) */
+	putShortMSB(s, (uInt)(strm->adler >> 16));
+	putShortMSB(s, (uInt)(strm->adler & 0xffff));
+    }
     flush_pending(strm);
     /* If avail_out is zero, the application will call deflate again
      * to flush the rest.
      */
-    s->noheader = -1; /* write the trailer only once! */
-    return s->pending != 0 ? Z_OK : Z_STREAM_END;
+    if (!s->noheader) {
+	s->noheader = -1; /* write the trailer only once! */
+    }
+    if (s->pending == 0) {
+	Assert(s->bi_valid == 0, "bi_buf not flushed");
+	return Z_STREAM_END;
+    }
+    return Z_OK;
 }
 
 /* ========================================================================= */
_

Patches currently in -mm which might be from zaslonko@linux.ibm.com are

lib-zlib-adjust-offset-calculation-for-dfltcc_state.patch
lib-zlib-implement-switching-between-dfltcc-and-software.patch
lib-zlib-fix-dfltcc-not-flushing-eobs-when-creating-raw-streams.patch
lib-zlib-fix-dfltcc-ignoring-flush-modes-when-avail_in-==-0.patch
lib-zlib-dfltcc-not-writing-header-bits-when-avail_out-==-0.patch
lib-zlib-split-deflate-and-inflate-states-for-dfltcc.patch
lib-zlib-dfltcc-support-inflate-with-small-window.patch
lib-zlib-dfltcc-always-switch-to-software-inflate-for-z_packet_flush-option.patch