From d259e194df12569c8fe286eacd285be28118ecd7 Mon Sep 17 00:00:00 2001 From: CoprDistGit Date: Sat, 7 Nov 2026 06:22:11 +0000 Subject: automatic import of zlib --- ...ess-MSAN-detections-in-deflate-slide_hash.patch | 36 ++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 backport-Suppress-MSAN-detections-in-deflate-slide_hash.patch (limited to 'backport-Suppress-MSAN-detections-in-deflate-slide_hash.patch') diff --git a/backport-Suppress-MSAN-detections-in-deflate-slide_hash.patch b/backport-Suppress-MSAN-detections-in-deflate-slide_hash.patch new file mode 100644 index 0000000..449a9e3 --- /dev/null +++ b/backport-Suppress-MSAN-detections-in-deflate-slide_hash.patch @@ -0,0 +1,36 @@ +From 981ee7570ad98a3cf1ae74d737e2ee619ed79171 Mon Sep 17 00:00:00 2001 +From: Andrzej Hunt +Date: Fri, 4 Jun 2021 18:25:19 +0200 +Subject: [PATCH] Suppress MSAN detections in deflate's slide_hash(). + +slide_hash() knowingly reads potentially uninitialized memory, see +comment lower down about prev[n] potentially being garbage. In +this case, the result is never used. + +Reference:https://github.com/madler/zlib/commit/981ee7570ad98a3cf1ae74d737e2ee619ed79171 +Conflict:NA +--- + deflate.c | 7 +++++++ + 1 file changed, 7 insertions(+) + +diff --git a/deflate.c b/deflate.c +index 5410497..8088083 100644 +--- a/deflate.c ++++ b/deflate.c +@@ -209,6 +209,13 @@ local const config configuration_table[10] = { + * bit values at the expense of memory usage). We slide even when level == 0 to + * keep the hash table consistent if we switch back to level > 0 later. + */ ++ ++#if defined(__has_feature) ++# if __has_feature(memory_sanitizer) ++ __attribute__((no_sanitize("memory"))) ++# endif ++#endif ++ + local void slide_hash(s) + deflate_state *s; + { +-- +2.27.0 + -- cgit v1.2.3