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hinic: Replace memcpy() with direct assignment

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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.

Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Tom Rix <trix@redhat.com>
Cc: Leon Romanovsky <leon@kernel.org>
Cc: Jiri Pirko <jiri@nvidia.com>
Cc: Vladimir Oltean <olteanv@gmail.com>
Cc: Simon Horman <simon.horman@corigine.com>
Cc: netdev@vger.kernel.org
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
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kees Cook 2022-06-15 22:23:12 -07:00 • committed by David S. Miller
parent 225b0ed27e
commit 2c0ab32b73
1 changed files with 1 additions and 3 deletions
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4
drivers/net/ethernet/huawei/hinic/hinic_devlink.c
View file

@ -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 ||