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| author | Chuck Lever <chuck.lever@oracle.com> | 2014-07-29 17:23:17 -0400 |
|---|---|---|
| committer | Anna Schumaker <Anna.Schumaker@Netapp.com> | 2014-07-31 16:22:52 -0400 |
| commit | 5fc83f470d8ada25927701512cf94a53dab6c4c8 (patch) | |
| tree | c5e2b937d425229b1f49d92ab69d2ea2f2c0946e /net/sunrpc | |
| parent | bf858ab0adcb36fc60a1d941749a7dd0a9bf3d8a (diff) | |
| download | linux-5fc83f470d8ada25927701512cf94a53dab6c4c8.tar.gz linux-5fc83f470d8ada25927701512cf94a53dab6c4c8.tar.bz2 linux-5fc83f470d8ada25927701512cf94a53dab6c4c8.zip | |
xprtrdma: Fix panic in rpcrdma_register_frmr_external()
seg1->mr_nsegs is not yet initialized when it is used to unmap
segments during an error exit. Use the same unmapping logic for
all error exits.
"if (frmr_wr.wr.fast_reg.length < len) {" used to be a BUG_ON check.
The broken code will never be executed under normal operation.
Fixes: c977dea (xprtrdma: Remove BUG_ON() call sites)
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: Steve Wise <swise@opengridcomputing.com>
Tested-by: Shirley Ma <shirley.ma@oracle.com>
Tested-by: Devesh Sharma <devesh.sharma@emulex.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'net/sunrpc')
| -rw-r--r-- | net/sunrpc/xprtrdma/verbs.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c index 176dafc6e6d7..f337bdaa9939 100644 --- a/net/sunrpc/xprtrdma/verbs.c +++ b/net/sunrpc/xprtrdma/verbs.c @@ -1548,9 +1548,8 @@ rpcrdma_register_frmr_external(struct rpcrdma_mr_seg *seg, frmr_wr.wr.fast_reg.page_shift = PAGE_SHIFT; frmr_wr.wr.fast_reg.length = page_no << PAGE_SHIFT; if (frmr_wr.wr.fast_reg.length < len) { - while (seg1->mr_nsegs--) - rpcrdma_unmap_one(ia, seg++); - return -EIO; + rc = -EIO; + goto out_err; } /* Bump the key */ @@ -1568,8 +1567,7 @@ rpcrdma_register_frmr_external(struct rpcrdma_mr_seg *seg, if (rc) { dprintk("RPC: %s: failed ib_post_send for register," " status %i\n", __func__, rc); - while (i--) - rpcrdma_unmap_one(ia, --seg); + goto out_err; } else { seg1->mr_rkey = seg1->mr_chunk.rl_mw->r.frmr.fr_mr->rkey; seg1->mr_base = seg1->mr_dma + pageoff; @@ -1577,6 +1575,10 @@ rpcrdma_register_frmr_external(struct rpcrdma_mr_seg *seg, seg1->mr_len = len; } *nsegs = i; + return 0; +out_err: + while (i--) + rpcrdma_unmap_one(ia, --seg); return rc; } |