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commit ed6b0fe710b631b99ed9fc28cefedfe69a16dc55
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Author: Brad Hubbard <bhubbard@redhat.com>
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Date: Wed Mar 18 14:51:26 2015 +0530
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Use calloc to allocate xports (BZ #17542)
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If xports is NULL in xprt_register we malloc it but if sock >
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_rpc_dtablesize() that memory does not get initialised and may in theory
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contain any value. Later we make a conditional jump in svc_getreq_common
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based on the uninitialised memory and this caused a general protection
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fault in rpc.statd on an older version of glibc but this code has not
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changed since that version.
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Following is the valgrind warning.
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==26802== Conditional jump or move depends on uninitialised value(s)
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==26802== at 0x5343A25: svc_getreq_common (in /lib64/libc-2.5.so)
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==26802== by 0x534357B: svc_getreqset (in /lib64/libc-2.5.so)
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==26802== by 0x10DE1F: ??? (in /sbin/rpc.statd)
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==26802== by 0x10D0EF: main (in /sbin/rpc.statd)
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==26802== Uninitialised value was created by a heap allocation
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==26802== at 0x4C2210C: malloc (vg_replace_malloc.c:195)
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==26802== by 0x53438BE: xprt_register (in /lib64/libc-2.5.so)
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==26802== by 0x53450DF: svcudp_bufcreate (in /lib64/libc-2.5.so)
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==26802== by 0x10FE32: ??? (in /sbin/rpc.statd)
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==26802== by 0x10D13E: main (in /sbin/rpc.statd)
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diff --git glibc-2.17-c758a686/sunrpc/svc.c glibc-2.17-c758a686/sunrpc/svc.c
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index 8c4e8a5..c6ccf10 100644
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--- glibc-2.17-c758a686/sunrpc/svc.c
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+++ glibc-2.17-c758a686/sunrpc/svc.c
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@@ -97,8 +97,8 @@ xprt_register (SVCXPRT *xprt)
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if (xports == NULL)
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{
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- xports = (SVCXPRT **) malloc (_rpc_dtablesize () * sizeof (SVCXPRT *));
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- if (xports == NULL) /* Don´t add handle */
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+ xports = (SVCXPRT **) calloc (_rpc_dtablesize (), sizeof (SVCXPRT *));
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+ if (xports == NULL) /* Don't add handle */
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return;
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}
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