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tipc: Use struct_size() helper

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Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes.

This code was detected with the help of Coccinelle and, audited and
fixed manually.

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gustavo A. R. Silva 2020-06-18 08:35:00 -05:00 committed by David S. Miller
parent 70fc6d9c14
commit e034c6d23b
2 changed files with 6 additions and 8 deletions
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8
net/tipc/link.c
View file

@ -1385,12 +1385,12 @@ u16 tipc_get_gap_ack_blks(struct tipc_gap_ack_blks **ga, struct tipc_link *l,
p = (struct tipc_gap_ack_blks *)msg_data(hdr);
sz = ntohs(p->len);
/* Sanity check */
if (sz == tipc_gap_ack_blks_sz(p->ugack_cnt + p->bgack_cnt)) {
if (sz == struct_size(p, gacks, p->ugack_cnt + p->bgack_cnt)) {
/* Good, check if the desired type exists */
if ((uc && p->ugack_cnt) || (!uc && p->bgack_cnt))
goto ok;
/* Backward compatible: peer might not support bc, but uc? */
} else if (uc && sz == tipc_gap_ack_blks_sz(p->ugack_cnt)) {
} else if (uc && sz == struct_size(p, gacks, p->ugack_cnt)) {
if (p->ugack_cnt) {
p->bgack_cnt = 0;
goto ok;
@ -1472,7 +1472,7 @@ static u16 tipc_build_gap_ack_blks(struct tipc_link *l, struct tipc_msg *hdr)
__tipc_build_gap_ack_blks(ga, l, ga->bgack_cnt) : 0;
/* Total len */
len = tipc_gap_ack_blks_sz(ga->bgack_cnt + ga->ugack_cnt);
len = struct_size(ga, gacks, ga->bgack_cnt + ga->ugack_cnt);
ga->len = htons(len);
return len;
}
@ -1521,7 +1521,7 @@ static int tipc_link_advance_transmq(struct tipc_link *l, struct tipc_link *r,
gacks = &ga->gacks[ga->bgack_cnt];
} else if (ga) {
/* Copy the Gap ACKs, bc part, for later renewal if needed */
this_ga = kmemdup(ga, tipc_gap_ack_blks_sz(ga->bgack_cnt),
this_ga = kmemdup(ga, struct_size(ga, gacks, ga->bgack_cnt),
GFP_ATOMIC);
if (likely(this_ga)) {
this_ga->start_index = 0;

6
net/tipc/msg.h
View file

@ -189,11 +189,9 @@ struct tipc_gap_ack_blks {
struct tipc_gap_ack gacks[];
};
#define tipc_gap_ack_blks_sz(n) (sizeof(struct tipc_gap_ack_blks) + \
sizeof(struct tipc_gap_ack) * (n))
#define MAX_GAP_ACK_BLKS 128
#define MAX_GAP_ACK_BLKS_SZ tipc_gap_ack_blks_sz(MAX_GAP_ACK_BLKS)
#define MAX_GAP_ACK_BLKS_SZ (sizeof(struct tipc_gap_ack_blks) + \
sizeof(struct tipc_gap_ack) * MAX_GAP_ACK_BLKS)
static inline struct tipc_msg *buf_msg(struct sk_buff *skb)
{