[patch] [SCSI] aic79xx: NULL dereference in debug code

[Dan Carpenter <dan.carpenter@xxxxxxxxxx>]

"ahd" can be NULL here and it gets dereferenced inside the call to
ahd_name().

Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

diff --git a/drivers/scsi/aic7xxx/aic79xx_core.c b/drivers/scsi/aic7xxx/aic79xx_core.c
index 25417d0..5db8925 100644
--- a/drivers/scsi/aic7xxx/aic79xx_core.c
+++ b/drivers/scsi/aic7xxx/aic79xx_core.c
@@ -6120,7 +6120,8 @@ ahd_alloc(void *platform_arg, char *name)
 #ifdef AHD_DEBUG
 	if ((ahd_debug & AHD_SHOW_MEMORY) != 0) {
 		printk("%s: scb size = 0x%x, hscb size = 0x%x\n",
-		       ahd_name(ahd), (u_int)sizeof(struct scb),
+		       ahd ? ahd_name(ahd) : "(null)",
+		       (u_int)sizeof(struct scb),
 		       (u_int)sizeof(struct hardware_scb));
 	}
 #endif
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