diff options
author | Chris Leech <christopher.leech@intel.com> | 2009-10-21 16:28:09 -0700 |
---|---|---|
committer | James Bottomley <James.Bottomley@suse.de> | 2009-12-04 12:00:34 -0600 |
commit | 8f550f937e9fdafa5c37e348e214aecec851ef3f (patch) | |
tree | 589cc0df120e995aaefb26ea0e353c4ecc789bc4 /drivers | |
parent | b7a727f1af953b00352d3a4b6c458c6e2872f94b (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')
-rw-r--r-- | drivers/scsi/libfc/fc_disc.c | 2 | ||||
-rw-r--r-- | drivers/scsi/libfc/fc_elsct.c | 4 | ||||
-rw-r--r-- | drivers/scsi/libfc/fc_fcp.c | 7 | ||||
-rw-r--r-- | drivers/scsi/libfc/fc_lport.c | 8 | ||||
-rw-r--r-- | drivers/scsi/libfc/fc_rport.c | 10 |
5 files changed, 15 insertions, 16 deletions
diff --git a/drivers/scsi/libfc/fc_disc.c b/drivers/scsi/libfc/fc_disc.c index c48799e9dd8..d4cb3f9b1a0 100644 --- a/drivers/scsi/libfc/fc_disc.c +++ b/drivers/scsi/libfc/fc_disc.c @@ -371,7 +371,7 @@ static void fc_disc_gpn_ft_req(struct fc_disc *disc) disc, lport->e_d_tov)) return; err: - fc_disc_error(disc, fp); + fc_disc_error(disc, NULL); } /** diff --git a/drivers/scsi/libfc/fc_elsct.c b/drivers/scsi/libfc/fc_elsct.c index 5cfa68732e9..92984587ff4 100644 --- a/drivers/scsi/libfc/fc_elsct.c +++ b/drivers/scsi/libfc/fc_elsct.c @@ -53,8 +53,10 @@ static struct fc_seq *fc_elsct_send(struct fc_lport *lport, did = FC_FID_DIR_SERV; } - if (rc) + if (rc) { + fc_frame_free(fp); return NULL; + } fc_fill_fc_hdr(fp, r_ctl, did, fc_host_port_id(lport->host), fh_type, FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); diff --git a/drivers/scsi/libfc/fc_fcp.c b/drivers/scsi/libfc/fc_fcp.c index 28bfe1c2c50..a67f53a5026 100644 --- a/drivers/scsi/libfc/fc_fcp.c +++ b/drivers/scsi/libfc/fc_fcp.c @@ -1051,7 +1051,6 @@ static int fc_fcp_cmd_send(struct fc_lport *lp, struct fc_fcp_pkt *fsp, seq = lp->tt.exch_seq_send(lp, fp, resp, fc_fcp_pkt_destroy, fsp, 0); if (!seq) { - fc_frame_free(fp); rc = -1; goto unlock; } @@ -1316,7 +1315,6 @@ static void fc_fcp_rec(struct fc_fcp_pkt *fsp) fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */ return; } - fc_frame_free(fp); retry: if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); @@ -1564,10 +1562,9 @@ static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset) seq = lp->tt.exch_seq_send(lp, fp, fc_fcp_srr_resp, NULL, fsp, jiffies_to_msecs(FC_SCSI_REC_TOV)); - if (!seq) { - fc_frame_free(fp); + if (!seq) goto retry; - } + fsp->recov_seq = seq; fsp->xfer_len = offset; fsp->xfer_contig_end = offset; 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 */ diff --git a/drivers/scsi/libfc/fc_rport.c b/drivers/scsi/libfc/fc_rport.c index 1f795e4e474..49abb839a22 100644 --- a/drivers/scsi/libfc/fc_rport.c +++ b/drivers/scsi/libfc/fc_rport.c @@ -632,7 +632,7 @@ static void fc_rport_enter_plogi(struct fc_rport_priv *rdata) if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_PLOGI, fc_rport_plogi_resp, rdata, lport->e_d_tov)) - fc_rport_error_retry(rdata, fp); + fc_rport_error_retry(rdata, NULL); else kref_get(&rdata->kref); } @@ -793,7 +793,7 @@ static void fc_rport_enter_prli(struct fc_rport_priv *rdata) if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_PRLI, fc_rport_prli_resp, rdata, lport->e_d_tov)) - fc_rport_error_retry(rdata, fp); + fc_rport_error_retry(rdata, NULL); else kref_get(&rdata->kref); } @@ -889,7 +889,7 @@ static void fc_rport_enter_rtv(struct fc_rport_priv *rdata) if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_RTV, fc_rport_rtv_resp, rdata, lport->e_d_tov)) - fc_rport_error_retry(rdata, fp); + fc_rport_error_retry(rdata, NULL); else kref_get(&rdata->kref); } @@ -919,7 +919,7 @@ static void fc_rport_enter_logo(struct fc_rport_priv *rdata) if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_LOGO, fc_rport_logo_resp, rdata, lport->e_d_tov)) - fc_rport_error_retry(rdata, fp); + fc_rport_error_retry(rdata, NULL); else kref_get(&rdata->kref); } @@ -1006,7 +1006,7 @@ static void fc_rport_enter_adisc(struct fc_rport_priv *rdata) } if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_ADISC, fc_rport_adisc_resp, rdata, lport->e_d_tov)) - fc_rport_error_retry(rdata, fp); + fc_rport_error_retry(rdata, NULL); else kref_get(&rdata->kref); } |