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svcrdma: Catch another Reply chunk overflow case 

When space in the Reply chunk runs out in the middle of a segment,
we end up passing a zero-length SGL to rdma_rw_ctx_init(), and it
oopses.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2020-11-12 14:47:14 -05:00
parent b650545978
commit e5decb2eb5
1 changed files with 2 additions and 0 deletions
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2
net/sunrpc/xprtrdma/svc_rdma_rw.c
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@ -460,6 +460,8 @@ svc_rdma_build_writes(struct svc_rdma_write_info *info,
offset += info->wi_seg_off; offset += info->wi_seg_off;
write_len = min(remaining, length - info->wi_seg_off); write_len = min(remaining, length - info->wi_seg_off);
if (!write_len)
goto out_overflow;
ctxt = svc_rdma_get_rw_ctxt(rdma, ctxt = svc_rdma_get_rw_ctxt(rdma,
(write_len >> PAGE_SHIFT) + 2); (write_len >> PAGE_SHIFT) + 2);
if (!ctxt) if (!ctxt)