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Message-ID: <20250930100508.120194-1-mehdi.benhadjkhelifa@gmail.com>
Date: Tue, 30 Sep 2025 11:03:44 +0100
From: Mehdi Ben Hadj Khelifa <mehdi.benhadjkhelifa@...il.com>
To: clm@...com,
dsterba@...e.com
Cc: linux-btrfs@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-kernel-mentees@...ts.linuxfoundation.org,
skhan@...uxfoundation.org,
david.hunter.linux@...il.com,
Mehdi Ben Hadj Khelifa <mehdi.benhadjkhelifa@...il.com>
Subject: [PATCH v2] btrfs: Refactor allocation size calculation in kzalloc()
Wrap allocation size calculation in struct_size() to
avoid potential overflows.
Signed-off-by: Mehdi Ben Hadj Khelifa <mehdi.benhadjkhelifa@...il.com>
---
Changelog:
Changes since v1:
-Use of struct_size() instead of size_add() and size_mul()
Link:https://lore.kernel.org/linux-btrfs/342929a3-ac5f-4953-a763-b81c60e66554@gmail.com/T/#mbe2932fec1a56e7db21bc8a3d1f1271a2c1422d7
fs/btrfs/volumes.c | 7 +------
1 file changed, 1 insertion(+), 6 deletions(-)
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index c6e3efd6f602..d349d0b180ac 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -6076,12 +6076,7 @@ struct btrfs_io_context *alloc_btrfs_io_context(struct btrfs_fs_info *fs_info,
{
struct btrfs_io_context *bioc;
- bioc = kzalloc(
- /* The size of btrfs_io_context */
- sizeof(struct btrfs_io_context) +
- /* Plus the variable array for the stripes */
- sizeof(struct btrfs_io_stripe) * (total_stripes),
- GFP_NOFS);
+ bioc = kzalloc(struct_size(bioc, stripes, total_stripes), GFP_NOFS);
if (!bioc)
return NULL;
--
2.51.0
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