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scsi: sym53c8xx: fix NULL pointer dereference panic in sym_int_sir()

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sym_int_sir() in sym_hipd.c does not check the command pointer for NULL before
using it in debug message prints.

Suggested-by: Matthew Wilcox <matthew.wilcox@oracle.com>
Signed-off-by: George Kennedy <george.kennedy@oracle.com>
Reviewed-by: Mark Kanda <mark.kanda@oracle.com>
Acked-by: Matthew Wilcox <matthew.wilcox@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
George Kennedy 2018-08-29 11:38:16 -04:00 committed by Martin K. Petersen
parent 6318cb7fb0
commit 288315e952
1 changed files with 11 additions and 4 deletions
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15
drivers/scsi/sym53c8xx_2/sym_hipd.c
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@ -4370,6 +4370,13 @@ static void sym_nego_rejected(struct sym_hcb *np, struct sym_tcb *tp, struct sym
OUTB(np, HS_PRT, HS_BUSY);
}
#define sym_printk(lvl, tp, cp, fmt, v...) do { \
if (cp) \
scmd_printk(lvl, cp->cmd, fmt, ##v); \
else \
starget_printk(lvl, tp->starget, fmt, ##v); \
} while (0)
/*
* chip exception handler for programmed interrupts.
*/
@ -4415,7 +4422,7 @@ static void sym_int_sir(struct sym_hcb *np)
* been selected with ATN. We do not want to handle that.
*/
case SIR_SEL_ATN_NO_MSG_OUT:
scmd_printk(KERN_WARNING, cp->cmd,
sym_printk(KERN_WARNING, tp, cp,
"No MSG OUT phase after selection with ATN\n");
goto out_stuck;
/*
@ -4423,7 +4430,7 @@ static void sym_int_sir(struct sym_hcb *np)
* having reselected the initiator.
*/
case SIR_RESEL_NO_MSG_IN:
scmd_printk(KERN_WARNING, cp->cmd,
sym_printk(KERN_WARNING, tp, cp,
"No MSG IN phase after reselection\n");
goto out_stuck;
/*
@ -4431,7 +4438,7 @@ static void sym_int_sir(struct sym_hcb *np)
* an IDENTIFY.
*/
case SIR_RESEL_NO_IDENTIFY:
scmd_printk(KERN_WARNING, cp->cmd,
sym_printk(KERN_WARNING, tp, cp,
"No IDENTIFY after reselection\n");
goto out_stuck;
/*
@ -4460,7 +4467,7 @@ static void sym_int_sir(struct sym_hcb *np)
case SIR_RESEL_ABORTED:
np->lastmsg = np->msgout[0];
np->msgout[0] = M_NOOP;
scmd_printk(KERN_WARNING, cp->cmd,
sym_printk(KERN_WARNING, tp, cp,
"message %x sent on bad reselection\n", np->lastmsg);
goto out;
/*