From: Kees Cook keescook@chromium.org
[ Upstream commit 1e70212e031528918066a631c9fdccda93a1ffaa ]
Under CONFIG_FORTIFY_SOURCE=y and CONFIG_UBSAN_BOUNDS=y, Clang is bugged here for calculating the size of the destination buffer (0x10 instead of 0x14). This copy is a fixed size (sizeof(struct fw_section_info_st)), with the source and dest being struct fw_section_info_st, so the memcpy should be safe, assuming the index is within bounds, which is UBSAN_BOUNDS's responsibility to figure out.
Avoid the whole thing and just do a direct assignment. This results in no change to the executable code.
[This is a duplicate of commit 2c0ab32b73cf ("hinic: Replace memcpy() with direct assignment") which was applied to net-next.]
Cc: Nick Desaulniers ndesaulniers@google.com Cc: Tom Rix trix@redhat.com Cc: llvm@lists.linux.dev Link: https://github.com/ClangBuiltLinux/linux/issues/1592 Signed-off-by: Kees Cook keescook@chromium.org Reviewed-by: Gustavo A. R. Silva gustavoars@kernel.org Tested-by: Nathan Chancellor nathan@kernel.org # build Link: https://lore.kernel.org/r/20220616052312.292861-1-keescook@chromium.org Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/huawei/hinic/hinic_devlink.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/drivers/net/ethernet/huawei/hinic/hinic_devlink.c b/drivers/net/ethernet/huawei/hinic/hinic_devlink.c index 60ae8bfc5f69..1749d26f4bef 100644 --- a/drivers/net/ethernet/huawei/hinic/hinic_devlink.c +++ b/drivers/net/ethernet/huawei/hinic/hinic_devlink.c @@ -43,9 +43,7 @@ static bool check_image_valid(struct hinic_devlink_priv *priv, const u8 *buf,
for (i = 0; i < fw_image->fw_info.fw_section_cnt; i++) { len += fw_image->fw_section_info[i].fw_section_len; - memcpy(&host_image->image_section_info[i], - &fw_image->fw_section_info[i], - sizeof(struct fw_section_info_st)); + host_image->image_section_info[i] = fw_image->fw_section_info[i]; }
if (len != fw_image->fw_len ||