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scsi: megaraid_mm: Fix end of loop tests for list_for_each_entry() 

The list_for_each_entry() iterator, "adapter" in this code, can never be
NULL.  If we exit the loop without finding the correct adapter then
"adapter" points invalid memory that is an offset from the list head.  This
will eventually lead to memory corruption and presumably a kernel crash.

Link: https://lore.kernel.org/r/20210708074642.23599-1-harshvardhan.jha@oracle.com
Acked-by: Sumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: Harshvardhan Jha <harshvardhan.jha@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Harshvardhan Jha 2021-07-08 13:16:42 +05:30 committed by Martin K. Petersen
parent d712d3fb48
commit 77541f78ea
1 changed files with 15 additions and 6 deletions
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21
drivers/scsi/megaraid/megaraid_mm.c
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@ -238,7 +238,7 @@ mraid_mm_get_adapter(mimd_t __user *umimd, int *rval)
mimd_t mimd;
uint32_t adapno;
int iterator;
bool is_found;
if (copy_from_user(&mimd, umimd, sizeof(mimd_t))) {
*rval = -EFAULT;
@ -254,12 +254,16 @@ mraid_mm_get_adapter(mimd_t __user *umimd, int *rval)
adapter = NULL;
iterator = 0;
is_found = false;
list_for_each_entry(adapter, &adapters_list_g, list) {
if (iterator++ == adapno) break;
if (iterator++ == adapno) {
is_found = true;
break;
}
}
if (!adapter) {
if (!is_found) {
*rval = -ENODEV;
return NULL;
}
@ -725,6 +729,7 @@ ioctl_done(uioc_t *kioc)
uint32_t adapno;
int iterator;
mraid_mmadp_t* adapter;
bool is_found;
/*
* When the kioc returns from driver, make sure it still doesn't
@ -747,19 +752,23 @@ ioctl_done(uioc_t *kioc)
iterator = 0;
adapter = NULL;
adapno = kioc->adapno;
is_found = false;
con_log(CL_ANN, ( KERN_WARNING "megaraid cmm: completed "
"ioctl that was timedout before\n"));
list_for_each_entry(adapter, &adapters_list_g, list) {
if (iterator++ == adapno) break;
if (iterator++ == adapno) {
is_found = true;
break;
}
}
kioc->timedout = 0;
if (adapter) {
if (is_found)
mraid_mm_dealloc_kioc( adapter, kioc );
}
}
else {
wake_up(&wait_q);