git: 03d26200a599 - stable/15 - MFC: MFV: zlib: Fix buffer overflow bug in non-blocking gzwrite.

The branch stable/15 has been updated by delphij:

URL: https://cgit.FreeBSD.org/src/commit/?id=03d26200a599dfab5dfe4a1b5f1d2356d6210ef7

commit 03d26200a599dfab5dfe4a1b5f1d2356d6210ef7
Author:     Xin LI <delphij@FreeBSD.org>
AuthorDate: 2026-10-13 05:49:35 +0000
Commit:     Xin LI <delphij@FreeBSD.org>
CommitDate: 2026-10-16 03:44:46 +0000

    MFC: MFV: zlib: Fix buffer overflow bug in non-blocking gzwrite.
    
    DIfferential revision:  https://reviews.freebsd.org/D60695
    
    (cherry picked from commit 7fe1d8abad3f55f127634c1ada7718bc1982089e)
---
 sys/contrib/zlib/gzwrite.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sys/contrib/zlib/gzwrite.c b/sys/contrib/zlib/gzwrite.c
index b0da973cc016..f2fefb94346c 100644
--- a/sys/contrib/zlib/gzwrite.c
+++ b/sys/contrib/zlib/gzwrite.c
@@ -243,8 +243,11 @@ local z_size_t gz_write(gz_statep state, voidpc buf, z_size_t len) {
             n -= state->strm.avail_in;
             state->x.pos += n;
             len -= n;
-            if (ret == -1)
+            if (ret == -1) {
+                state->strm.avail_in = 0;
+                state->strm.next_in = state->in;
                 return state->again ? put - len : 0;
+            }
         } while (len);
     }