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commit 4a2d85c64110ee9e21a8c4f9dafd6b0ae621506d
Author: Zhi Li <yieli>
Date: Fri Oct 28 14:19:04 2022 -0400
clnt_raw.c: fix a possible null pointer dereference
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory (libtirpc bug fix and enhancement update), and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2023:2506
Description of problem: Possibly null pointer dereference in clnt_raw_freeres() of /root/libtirpc-1.3.3/src/clnt_raw.c 240 /* ARGSUSED */ 241 static bool_t 242 clnt_raw_freeres(cl, xdr_res, res_ptr) 243 CLIENT *cl; 244 xdrproc_t xdr_res; 245 void *res_ptr; 246 { 247 struct clntraw_private *clp = clntraw_private; 248 XDR *xdrs = &clp->xdr_stream; // << pointer clp could be NULL here 249 bool_t rval; 250 251 mutex_lock(&clntraw_lock); 252 if (clp == NULL) { 253 rval = (bool_t) RPC_FAILED; 254 mutex_unlock(&clntraw_lock); 255 return (rval); 256 } 257 mutex_unlock(&clntraw_lock); 258 xdrs->x_op = XDR_FREE; 259 return ((*xdr_res)(xdrs, res_ptr)); 260 } captured from clang-static-analyzer Since the mutex clntraw_lock exists in multiple functions, and the valid structure of clntraw_private is allocated in clnt_raw_create(), who shares the same mutex with clnt_raw_freeres(), if that function is invoked before clnt_raw_create() in parallel or serial manner, the dereference of clp could lead to a null pointer reference. 76 /* 77 * Create a client handle for memory based rpc. 78 */ 79 CLIENT * 80 clnt_raw_create(prog, vers) 81 rpcprog_t prog; 82 rpcvers_t vers; 83 { 84 struct clntraw_private *clp; 85 struct rpc_msg call_msg; 86 XDR *xdrs; 87 CLIENT *client; 88 89 mutex_lock(&clntraw_lock); 90 clp = clntraw_private; 91 if (clp == NULL) { 92 clp = (struct clntraw_private *)calloc(1, sizeof (*clp)); // clntraw_private allocated here 93 if (clp == NULL) { 94 mutex_unlock(&clntraw_lock); 95 return NULL; 96 } 97 if (__rpc_rawcombuf == NULL) 98 __rpc_rawcombuf = 99 (char *)calloc(UDPMSGSIZE, sizeof (char)); 100 clp->_raw_buf = __rpc_rawcombuf; 101 clntraw_private = clp; 102 } 103 xdrs = &clp->xdr_stream; 104 client = &clp->client_object; -- snip -- Version-Release number of selected component (if applicable): libtirpc-1.1.3.el9