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scsi: fusion: fix string overflow warning 

gcc points out a theorerical string overflow:

drivers/message/fusion/mptbase.c: In function 'mpt_detach':
drivers/message/fusion/mptbase.c:2103:17: error: '%s' directive writing up to 31 bytes into a region of size 28 [-Werror=format-overflow=]
sprintf(pname, MPT_PROCFS_MPTBASEDIR "/%s/summary", ioc->name);
               ^~~~~
drivers/message/fusion/mptbase.c:2103:2: note: 'sprintf' output between 13 and 44 bytes into a destination of size 32

We can simply double the size of the local buffer here to be on the
safe side, and using snprintf() instead of sprintf() protects us
if ioc->name was not terminated properly.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Arnd Bergmann 2017-07-17 14:00:00 +02:00 committed by Martin K. Petersen
parent 345ebae7d0
commit b192b42a70
1 changed files with 4 additions and 4 deletions
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8
drivers/message/fusion/mptbase.c
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@ -2079,7 +2079,7 @@ void
mpt_detach(struct pci_dev *pdev)
{
MPT_ADAPTER *ioc = pci_get_drvdata(pdev);
char pname[32];
char pname[64];
u8 cb_idx;
unsigned long flags;
struct workqueue_struct *wq;
@ -2100,11 +2100,11 @@ mpt_detach(struct pci_dev *pdev)
spin_unlock_irqrestore(&ioc->fw_event_lock, flags);
destroy_workqueue(wq);
sprintf(pname, MPT_PROCFS_MPTBASEDIR "/%s/summary", ioc->name);
snprintf(pname, sizeof(pname), MPT_PROCFS_MPTBASEDIR "/%s/summary", ioc->name);
remove_proc_entry(pname, NULL);
sprintf(pname, MPT_PROCFS_MPTBASEDIR "/%s/info", ioc->name);
snprintf(pname, sizeof(pname), MPT_PROCFS_MPTBASEDIR "/%s/info", ioc->name);
remove_proc_entry(pname, NULL);
sprintf(pname, MPT_PROCFS_MPTBASEDIR "/%s", ioc->name);
snprintf(pname, sizeof(pname), MPT_PROCFS_MPTBASEDIR "/%s", ioc->name);
remove_proc_entry(pname, NULL);
/* call per device driver remove entry point */