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authorHeiko Carstens <heiko.carstens@de.ibm.com>2007-12-20 12:30:22 +0100
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2008-01-11 18:29:00 -0600
commitd1ad09db2fd551d49d65ef040591cb9298e70fb6 (patch)
treee26e31c96068ce3ab58ed14d4e51d68a308d3891
parentbfd90dce248a49ced2b7419ecf78af9f7f37039e (diff)
[SCSI] zfcp: fix use after free bug.
zfcp_erp_strategy_check_fsfreq() checks if it is safe to access the fsf_req associated with the erp_action that gets passed. To test if it is safe it accesses the fsf_req in order to get its index into the hash list. This is broken since the fsf_req might be freed already and the read index has no meaning. It could lead to memory corruption. Fix this by introducing a new zfcp_reqlist_find_safe() method which just checks if addresses are equal. This is slower, but only gets called in case of error recovery. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: Martin Peschke <mp3@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
-rw-r--r--drivers/s390/scsi/zfcp_def.h14
-rw-r--r--drivers/s390/scsi/zfcp_erp.c3
2 files changed, 16 insertions, 1 deletions
diff --git a/drivers/s390/scsi/zfcp_def.h b/drivers/s390/scsi/zfcp_def.h
index 294d0792e82..9e9f6c1e4e5 100644
--- a/drivers/s390/scsi/zfcp_def.h
+++ b/drivers/s390/scsi/zfcp_def.h
@@ -1123,6 +1123,20 @@ zfcp_reqlist_find(struct zfcp_adapter *adapter, unsigned long req_id)
return NULL;
}
+static inline struct zfcp_fsf_req *
+zfcp_reqlist_find_safe(struct zfcp_adapter *adapter, struct zfcp_fsf_req *req)
+{
+ struct zfcp_fsf_req *request;
+ unsigned int idx;
+
+ for (idx = 0; idx < REQUEST_LIST_SIZE; idx++) {
+ list_for_each_entry(request, &adapter->req_list[idx], list)
+ if (request == req)
+ return request;
+ }
+ return NULL;
+}
+
/*
* functions needed for reference/usage counting
*/
diff --git a/drivers/s390/scsi/zfcp_erp.c b/drivers/s390/scsi/zfcp_erp.c
index 67d74ed0f25..76fef3f6387 100644
--- a/drivers/s390/scsi/zfcp_erp.c
+++ b/drivers/s390/scsi/zfcp_erp.c
@@ -846,7 +846,8 @@ zfcp_erp_strategy_check_fsfreq(struct zfcp_erp_action *erp_action)
if (erp_action->fsf_req) {
/* take lock to ensure that request is not deleted meanwhile */
spin_lock(&adapter->req_list_lock);
- if (zfcp_reqlist_find(adapter, erp_action->fsf_req->req_id)) {
+ if (zfcp_reqlist_find_safe(adapter, erp_action->fsf_req) &&
+ erp_action->fsf_req->erp_action == erp_action) {
/* fsf_req still exists */
debug_text_event(adapter->erp_dbf, 3, "a_ca_req");
debug_event(adapter->erp_dbf, 3, &erp_action->fsf_req,