Messages in this thread | | | From | Colin Ian King <> | Subject | re: xprtrdma: Prevent inline overflow | Date | Wed, 15 Jul 2020 16:56:58 +0100 |
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Hi,
Static analysis with Coverity has found a potential issue with the header size calculations in source net/sunrpc/xprtrdma/rpc_rdma.c in functions rpcrdma_max_call_header_size and rpcrdma_max_reply_header_size.
The commit in question is relatively old:
commit 302d3deb20682a076e1ab551821cacfdc81c5e4f Author: Chuck Lever <chuck.lever@oracle.com> Date: Mon May 2 14:41:05 2016 -0400
xprtrdma: Prevent inline overflow
The two issues are as follows:
Issue #1:
66 static unsigned int rpcrdma_max_call_header_size(unsigned int maxsegs) 67 { 68 unsigned int size; 69 70 /* Fixed header fields and list discriminators */
Unused value (UNUSED_VALUE)
71 size = RPCRDMA_HDRLEN_MIN; 72 73 /* Maximum Read list size */ 74 size = maxsegs * rpcrdma_readchunk_maxsz * sizeof(__be32); 75
should the size assignment on line 74 be instead:
size += maxsegs * rpcrdma_readchunk_maxsz * sizeof(__be32);
Issue #2:
89 static unsigned int rpcrdma_max_reply_header_size(unsigned int maxsegs) 90 { 91 unsigned int size; 92 93 /* Fixed header fields and list discriminators */
Unused value (UNUSED_VALUE)
94 size = RPCRDMA_HDRLEN_MIN; 95 96 /* Maximum Write list size */ 97 size = sizeof(__be32); /* segment count */
should the size assignment in line 97 be instead:
size += sizeof(__be32)?
Colin
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