From mboxrd@z Thu Jan 1 00:00:00 1970 From: Colin King Date: Mon, 06 Jul 2020 13:08:20 +0000 Subject: [PATCH][next] scsi: lpfc: fix less than zero comparison on unsigned int computation Message-Id: <20200706130820.487271-1-colin.king@canonical.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: James Smart , Dick Kennedy , "James E . J . Bottomley" , "Martin K . Petersen" , linux-scsi@vger.kernel.org Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org From: Colin Ian King The expressions start_idx - dbg_cnt is evaluated using unsigned int arthithmetic (since these variables are unsigned ints) and hence can never be less than zero, so the less than comparison is never true. Re-write the expression to check for start_idx being less than dbg_cnt. Addresses-Coverity: ("Unsigned compared against 0") Fixes: 372c187b8a70 ("scsi: lpfc: Add an internal trace log buffer") Signed-off-by: Colin Ian King --- drivers/scsi/lpfc/lpfc_init.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c index 7285b0114837..ce5afe7b11d0 100644 --- a/drivers/scsi/lpfc/lpfc_init.c +++ b/drivers/scsi/lpfc/lpfc_init.c @@ -14152,7 +14152,7 @@ void lpfc_dmp_dbg(struct lpfc_hba *phba) if ((start_idx + dbg_cnt) > (DBG_LOG_SZ - 1)) { temp_idx = (start_idx + dbg_cnt) % DBG_LOG_SZ; } else { - if ((start_idx - dbg_cnt) < 0) { + if (start_idx < dbg_cnt) { start_idx = DBG_LOG_SZ - (dbg_cnt - start_idx); temp_idx = 0; } else { -- 2.27.0