Unverified Commit bc877517 authored by openeuler-ci-bot's avatar openeuler-ci-bot Committed by Gitee
Browse files

!9027 tty: n_gsm: fix possible out-of-bounds in gsm0_receive() 

Merge Pull Request from: @ci-robot 
 
PR sync from: Cui GaoSheng <cuigaosheng1@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/I2IIPE2MD4465RY6N366IN6GCC3CO6IT/ 
 
https://gitee.com/src-openeuler/kernel/issues/I9TAHR 
 
Link:https://gitee.com/openeuler/kernel/pulls/9027

 

Reviewed-by: default avatarJialin Zhang <zhangjialin11@huawei.com>
Signed-off-by: default avatarJialin Zhang <zhangjialin11@huawei.com>
parents 695c5aec 281c567e

drivers/tty/n_gsm.c

+6 −2
Original line number Diff line number Diff line
@@ -2082,8 +2082,12 @@ static void gsm0_receive(struct gsm_mux *gsm, unsigned char c) 
		break;

	case GSM_DATA:		/* Data */

		gsm->buf[gsm->count++] = c;

		if (gsm->count == gsm->len)

		if (gsm->count >= MAX_MRU) {

			gsm->bad_size++;

			gsm->state = GSM_SEARCH;

		} else if (gsm->count >= gsm->len) {

			gsm->state = GSM_FCS;

		}

		break;

	case GSM_FCS:		/* FCS follows the packet */

		gsm->received_fcs = c;
@@ -2176,7 +2180,7 @@ static void gsm1_receive(struct gsm_mux *gsm, unsigned char c) 
		gsm->state = GSM_DATA;

		break;

	case GSM_DATA:		/* Data */

		if (gsm->count > gsm->mru) {	/* Allow one for the FCS */

		if (gsm->count > gsm->mru || gsm->count > MAX_MRU) {	/* Allow one for the FCS */

			gsm->state = GSM_OVERRUN;

			gsm->bad_size++;

		} else