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Message-Id: <20190412083301.25503-1-colin.king@canonical.com> Date: Fri, 12 Apr 2019 09:33:01 +0100 From: Colin King <colin.king@...onical.com> To: Karen Xie <kxie@...lsio.com>, "James E . J . Bottomley" <jejb@...ux.ibm.com>, "Martin K . Petersen" <martin.petersen@...cle.com>, linux-scsi@...r.kernel.org Cc: kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [PATCH][V3] scsi: cxgbi: remove redundant __kfree_skb call on skb and free cst->atid From: Colin Ian King <colin.king@...onical.com> The error return path via label rel_resource checks for a non-null skb before free'ing it. However, skb is always null at this exit path, so the null check and the free are redundant and can be removed. Removing this allows the original goto's to rel_resource to be cleaned up; the first can be replaced by a return of -EINVAL, the second can be replaced by a more appropriate -ENOMEM return and fix a memory leak by freeing csk->atid. Addresses-Coverity: ("Logically Dead Code") Signed-off-by: Colin Ian King <colin.king@...onical.com> --- V2: Ensure cst->atid is free'd to fix memory leak, thanks to Walter Harms for spotting this mistake in V1. V3: Add missing cxgbi_sock_put, thanks to Dan Carpenter for spotting this mistake in V2. --- drivers/scsi/cxgbi/cxgb3i/cxgb3i.c | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-) diff --git a/drivers/scsi/cxgbi/cxgb3i/cxgb3i.c b/drivers/scsi/cxgbi/cxgb3i/cxgb3i.c index 75e1273a44b3..b8dd9e648dd0 100644 --- a/drivers/scsi/cxgbi/cxgb3i/cxgb3i.c +++ b/drivers/scsi/cxgbi/cxgb3i/cxgb3i.c @@ -979,14 +979,17 @@ static int init_act_open(struct cxgbi_sock *csk) csk->atid = cxgb3_alloc_atid(t3dev, &t3_client, csk); if (csk->atid < 0) { pr_err("NO atid available.\n"); - goto rel_resource; + return -EINVAL; } cxgbi_sock_set_flag(csk, CTPF_HAS_ATID); cxgbi_sock_get(csk); skb = alloc_wr(sizeof(struct cpl_act_open_req), 0, GFP_KERNEL); - if (!skb) - goto rel_resource; + if (!skb) { + cxgb3_free_atid(t3dev, csk->atid); + cxgbi_sock_put(csk); + return -ENOMEM; + } skb->sk = (struct sock *)csk; set_arp_failure_handler(skb, act_open_arp_failure); csk->snd_win = cxgb3i_snd_win; @@ -1007,11 +1010,6 @@ static int init_act_open(struct cxgbi_sock *csk) cxgbi_sock_set_state(csk, CTP_ACTIVE_OPEN); send_act_open_req(csk, skb, csk->l2t); return 0; - -rel_resource: - if (skb) - __kfree_skb(skb); - return -EINVAL; } cxgb3_cpl_handler_func cxgb3i_cpl_handlers[NUM_CPL_CMDS] = { -- 2.20.1
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