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| author | Heiko Carstens | 2007-12-20 12:30:22 +0100 |
|---|---|---|
| committer | James Bottomley | 2008-01-12 01:29:00 +0100 |
| commit | d1ad09db2fd551d49d65ef040591cb9298e70fb6 (patch) | |
| tree | e26e31c96068ce3ab58ed14d4e51d68a308d3891 /drivers/s390/scsi/zfcp_def.h | |
| parent | [SCSI] megaraid: add __devexit annotation (diff) | |
| download | kernel-qcow2-linux-d1ad09db2fd551d49d65ef040591cb9298e70fb6.tar.gz kernel-qcow2-linux-d1ad09db2fd551d49d65ef040591cb9298e70fb6.tar.xz kernel-qcow2-linux-d1ad09db2fd551d49d65ef040591cb9298e70fb6.zip | |
[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 294d0792e82b..9e9f6c1e4e5d 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 */ |