From 633a9b6f514c12b3ee42b3a4e647f137aca1e198 Mon Sep 17 00:00:00 2001
From: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Date: Tue, 15 Nov 2022 15:55:34 -0600
Subject: [PATCH] wifi: brcmfmac: Use struct_size() in code ralated to struct
brcmf_dload_data_le
Prefer struct_size() over open-coded versions of idiom:
sizeof(struct-with-flex-array) + sizeof(typeof-flex-array-elements) * count
where count is the max number of items the flexible array is supposed to
contain.
In this particular case, in the open-coded version sizeof(typeof-flex-array-elements)
is implicit in _count_ because the type of the flex array data is u8:
drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h:941:
941 struct brcmf_dload_data_le {
942 __le16 flag;
943 __le16 dload_type;
944 __le32 len;
945 __le32 crc;
946 u8 data[];
947 };
Link: https://github.com/KSPP/linux/issues/160
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/41845ad3660ed4375f0c03fd36a67b2e12fafed5.1668548907.git.gustavoars@kernel.org
---
drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c
index 2e836566e2182..4a309e5a5707b 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c
@@ -110,9 +110,9 @@ static int brcmf_c_download(struct brcmf_if *ifp, u16 flag,
dload_buf->dload_type = cpu_to_le16(DL_TYPE_CLM);
dload_buf->len = cpu_to_le32(len);
dload_buf->crc = cpu_to_le32(0);
- len = sizeof(*dload_buf) + len;
- err = brcmf_fil_iovar_data_set(ifp, "clmload", dload_buf, len);
+ err = brcmf_fil_iovar_data_set(ifp, "clmload", dload_buf,
+ struct_size(dload_buf, data, len));
return err;
}
@@ -139,7 +139,8 @@ static int brcmf_c_process_clm_blob(struct brcmf_if *ifp)
return 0;
}
- chunk_buf = kzalloc(sizeof(*chunk_buf) + MAX_CHUNK_LEN, GFP_KERNEL);
+ chunk_buf = kzalloc(struct_size(chunk_buf, data, MAX_CHUNK_LEN),
+ GFP_KERNEL);
if (!chunk_buf) {
err = -ENOMEM;
goto done;
--
2.30.2