diff options
| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2007-12-20 12:30:22 +0100 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2008-01-11 18:29:00 -0600 |
| commit | d1ad09db2fd551d49d65ef040591cb9298e70fb6 (patch) | |
| tree | e26e31c96068ce3ab58ed14d4e51d68a308d3891 /drivers/s390/scsi/zfcp_def.h | |
| parent | bfd90dce248a49ced2b7419ecf78af9f7f37039e (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>
Diffstat (limited to 'drivers/s390/scsi/zfcp_def.h')
| -rw-r--r-- | drivers/s390/scsi/zfcp_def.h | 14 |
1 files changed, 14 insertions, 0 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 */ |