From: Kent Overstreet <kent.overstreet@linux.dev>
Date: Wed, 28 Dec 2022 20:17:07 +0000 (-0500)
Subject: bcachefs: Fix some memcpy() warnings
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=2cc9c0db89f7b6e3c3218ddaa7964055af8d95af;p=linux.git

bcachefs: Fix some memcpy() warnings

With CONFIG_FORTIFY_SOURCE, the compiler attempts to warn about mempcys
that extend past struct field boundaries. This results in some spurious
warnings where we use embedded variable length structs, this patch
switches to unsafe_mecpy() to fix the warnings.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
---

diff --git a/fs/bcachefs/buckets.c b/fs/bcachefs/buckets.c
index 49cb2589f47cb..137a9aef69875 100644
--- a/fs/bcachefs/buckets.c
+++ b/fs/bcachefs/buckets.c
@@ -156,7 +156,8 @@ retry:
 
 	do {
 		seq = read_seqcount_begin(&c->usage_lock);
-		memcpy(&ret->u, c->usage_base, u64s * sizeof(u64));
+		unsafe_memcpy(&ret->u, c->usage_base, u64s * sizeof(u64),
+			      "embedded variable length struct");
 		for (i = 0; i < ARRAY_SIZE(c->usage); i++)
 			acc_u64s_percpu((u64 *) &ret->u, (u64 __percpu *) c->usage[i], u64s);
 	} while (read_seqcount_retry(&c->usage_lock, seq));