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Commit 638e628a authored by Sjur Braendeland's avatar Sjur Braendeland Committed by David S. Miller
Browse files

caif: Bugfix - handle mem-allocation failures 



Discovered bugs when injecting slab allocation failures.
Add checks on all memory allocation.

Signed-off-by: default avatarSjur Braendeland <sjur.brandeland@stericsson.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7aecf494

net/caif/cfpkt_skbuff.c

+17 −8
Original line number Diff line number Diff line
@@ -238,6 +238,7 @@ int cfpkt_add_head(struct cfpkt *pkt, const void *data2, u16 len) 
	struct sk_buff *lastskb;

	u8 *to;

	const u8 *data = data2;

	int ret;

	if (unlikely(is_erronous(pkt)))

		return -EPROTO;

	if (unlikely(skb_headroom(skb) < len)) {
@@ -246,9 +247,10 @@ int cfpkt_add_head(struct cfpkt *pkt, const void *data2, u16 len) 
	}



	/* Make sure data is writable */

	if (unlikely(skb_cow_data(skb, 0, &lastskb) < 0)) {

	ret = skb_cow_data(skb, 0, &lastskb);

	if (unlikely(ret < 0)) {

		PKT_ERROR(pkt, "cfpkt_add_head: cow failed\n");

		return -EPROTO;

		return ret;

	}



	to = skb_push(skb, len);
@@ -316,6 +318,8 @@ EXPORT_SYMBOL(cfpkt_setlen); 
struct cfpkt *cfpkt_create_uplink(const unsigned char *data, unsigned int len)

{

	struct cfpkt *pkt = cfpkt_create_pfx(len + PKT_POSTFIX, PKT_PREFIX);

	if (!pkt)

		return NULL;

	if (unlikely(data != NULL))

		cfpkt_add_body(pkt, data, len);

	return pkt;
@@ -344,12 +348,13 @@ struct cfpkt *cfpkt_append(struct cfpkt *dstpkt, 


	if (dst->tail + neededtailspace > dst->end) {

		/* Create a dumplicate of 'dst' with more tail space */

		struct cfpkt *tmppkt;

		dstlen = skb_headlen(dst);

		createlen = dstlen + neededtailspace;

		tmp = pkt_to_skb(

			cfpkt_create(createlen + PKT_PREFIX + PKT_POSTFIX));

		if (!tmp)

		tmppkt = cfpkt_create(createlen + PKT_PREFIX + PKT_POSTFIX);

		if (tmppkt == NULL)

			return NULL;

		tmp = pkt_to_skb(tmppkt);

		skb_set_tail_pointer(tmp, dstlen);

		tmp->len = dstlen;

		memcpy(tmp->data, dst->data, dstlen);
@@ -368,6 +373,7 @@ struct cfpkt *cfpkt_split(struct cfpkt *pkt, u16 pos) 
{

	struct sk_buff *skb2;

	struct sk_buff *skb = pkt_to_skb(pkt);

	struct cfpkt *tmppkt;

	u8 *split = skb->data + pos;

	u16 len2nd = skb_tail_pointer(skb) - split;
@@ -381,9 +387,12 @@ struct cfpkt *cfpkt_split(struct cfpkt *pkt, u16 pos) 
	}



	/* Create a new packet for the second part of the data */

	skb2 = pkt_to_skb(

		cfpkt_create_pfx(len2nd + PKT_PREFIX + PKT_POSTFIX,

				 PKT_PREFIX));

	tmppkt = cfpkt_create_pfx(len2nd + PKT_PREFIX + PKT_POSTFIX,

				  PKT_PREFIX);

	if (tmppkt == NULL)

		return NULL;

	skb2 = pkt_to_skb(tmppkt);





	if (skb2 == NULL)

		return NULL;

net/caif/cfserl.c

+2 −1
Original line number Diff line number Diff line
@@ -67,6 +67,8 @@ static int cfserl_receive(struct cflayer *l, struct cfpkt *newpkt) 
		layr->incomplete_frm =

		    cfpkt_append(layr->incomplete_frm, newpkt, expectlen);

		pkt = layr->incomplete_frm;

		if (pkt == NULL)

			return -ENOMEM;

	} else {

		pkt = newpkt;

	}
@@ -154,7 +156,6 @@ static int cfserl_receive(struct cflayer *l, struct cfpkt *newpkt) 
			if (layr->usestx) {

				if (tail_pkt != NULL)

					pkt = cfpkt_append(pkt, tail_pkt, 0);



				/* Start search for next STX if frame failed */

				continue;

			} else {

net/caif/cfsrvl.c

+6 −0
Original line number Diff line number Diff line
@@ -123,6 +123,12 @@ static int cfservl_modemcmd(struct cflayer *layr, enum caif_modemcmd ctrl) 
			struct caif_payload_info *info;

			u8 flow_off = SRVL_FLOW_OFF;

			pkt = cfpkt_create(SRVL_CTRL_PKT_SIZE);

			if (!pkt) {

				pr_warning("CAIF: %s(): Out of memory\n",

					__func__);

				return -ENOMEM;

			}



			if (cfpkt_add_head(pkt, &flow_off, 1) < 0) {

				pr_err("CAIF: %s(): Packet is erroneous!\n",

					__func__);