[PATCH AUTOSEL 6.1 14/26] devres: Use kmalloc_size_roundup() to match ksize() usage

Sasha Levin
2022-12-24T01:31:45Z

From: Kees Cook <keescook@chromium.org>

[ Upstream commit 6fcd7e702d3d91cc2c3194acffd7d67b2c10b81f ]

Round up allocations with kmalloc_size_roundup() so that devres's use
of ksize() is always accurate and no special handling of the memory is
needed by KASAN, UBSAN_BOUNDS, nor FORTIFY_SOURCE.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20221018090406.never.856-kees@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/base/devres.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/base/devres.c b/drivers/base/devres.c
index 4ab2b50ee38f..c0e100074aa3 100644
--- a/drivers/base/devres.c
+++ b/drivers/base/devres.c
@@ -101,6 +101,9 @@ static bool check_dr_size(size_t size, size_t *tot_size)
size, tot_size)))
return false;

+ /* Actually allocate the full kmalloc bucket size. */
+ *tot_size = kmalloc_size_roundup(*tot_size);
+
return true;
}

--
2.35.1