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authorChris Leech <christopher.leech@intel.com>2009-10-21 16:28:09 -0700
committerJames Bottomley <James.Bottomley@suse.de>2009-12-04 12:00:34 -0600
commit8f550f937e9fdafa5c37e348e214aecec851ef3f (patch)
tree589cc0df120e995aaefb26ea0e353c4ecc789bc4 /drivers/scsi/libfc/fc_lport.c
parentb7a727f1af953b00352d3a4b6c458c6e2872f94b (diff)
[SCSI] libfc: fix memory corruption caused by double frees and bad error handling
I was running into several different panics under stress, which I traced down to a few different possible slab corruption issues in error handling paths. I have not yet looked into why these exchange sends fail, but with these fixes my test system is much more stable under stress than before. fc_elsct_send() could fail and either leave the passed in frame intact (failure in fc_ct/els_fill) or the frame could have been freed if the failure was is fc_exch_seq_send(). The caller had no way of knowing, and there was a potential double free in the error handling in fc_fcp_rec(). Make fc_elsct_send() always free the frame before returning, and remove the fc_frame_free() call in fc_fcp_rec(). While fc_exch_seq_send() did always consume the frame, there were double free bugs in the error handling of fc_fcp_cmd_send() and fc_fcp_srr() as well. Numerous calls to error handling routines (fc_disc_error(), fc_lport_error(), fc_rport_error_retry() ) were passing in a frame pointer that had already been freed in the case of an error. I have changed the call sites to pass in a NULL pointer, but there may be more appropriate error codes to use. Question: Why do these error routines take a frame pointer anyway? I understand passing in a pointer encoded error to the response handlers, but the error routines take no action on a valid pointer and should never be called that way. Signed-off-by: Chris Leech <christopher.leech@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'drivers/scsi/libfc/fc_lport.c')
-rw-r--r--drivers/scsi/libfc/fc_lport.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/scsi/libfc/fc_lport.c b/drivers/scsi/libfc/fc_lport.c
index 0d19ffa8871..536492ae6a8 100644
--- a/drivers/scsi/libfc/fc_lport.c
+++ b/drivers/scsi/libfc/fc_lport.c
@@ -1115,7 +1115,7 @@ static void fc_lport_enter_scr(struct fc_lport *lport)
if (!lport->tt.elsct_send(lport, FC_FID_FCTRL, fp, ELS_SCR,
fc_lport_scr_resp, lport, lport->e_d_tov))
- fc_lport_error(lport, fp);
+ fc_lport_error(lport, NULL);
}
/**
@@ -1186,7 +1186,7 @@ static void fc_lport_enter_rpn_id(struct fc_lport *lport)
if (!lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, FC_NS_RPN_ID,
fc_lport_rpn_id_resp,
lport, lport->e_d_tov))
- fc_lport_error(lport, fp);
+ fc_lport_error(lport, NULL);
}
static struct fc_rport_operations fc_lport_rport_ops = {
@@ -1340,7 +1340,7 @@ static void fc_lport_enter_logo(struct fc_lport *lport)
if (!lport->tt.elsct_send(lport, FC_FID_FLOGI, fp, ELS_LOGO,
fc_lport_logo_resp, lport, lport->e_d_tov))
- fc_lport_error(lport, fp);
+ fc_lport_error(lport, NULL);
}
/**
@@ -1456,7 +1456,7 @@ void fc_lport_enter_flogi(struct fc_lport *lport)
if (!lport->tt.elsct_send(lport, FC_FID_FLOGI, fp, ELS_FLOGI,
fc_lport_flogi_resp, lport, lport->e_d_tov))
- fc_lport_error(lport, fp);
+ fc_lport_error(lport, NULL);
}
/* Configure a fc_lport */