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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 >
_rpc_dtablesize() that memory does not get initialised and may in theory
contain any value. Later we make a conditional jump in svc_getreq_common
based on the uninitialised memory and this caused a general protection
fault in rpc.statd on an older version of glibc but this code has not
changed since that version.

Following is the valgrind warning.

==26802== Conditional jump or move depends on uninitialised value(s)
==26802==    at 0x5343A25: svc_getreq_common (in /lib64/libc-2.5.so)
==26802==    by 0x534357B: svc_getreqset (in /lib64/libc-2.5.so)
==26802==    by 0x10DE1F: ??? (in /sbin/rpc.statd)
==26802==    by 0x10D0EF: main (in /sbin/rpc.statd)
==26802==  Uninitialised value was created by a heap allocation
==26802==    at 0x4C2210C: malloc (vg_replace_malloc.c:195)
==26802==    by 0x53438BE: xprt_register (in /lib64/libc-2.5.so)
==26802==    by 0x53450DF: svcudp_bufcreate (in /lib64/libc-2.5.so)
==26802==    by 0x10FE32: ??? (in /sbin/rpc.statd)
==26802==    by 0x10D13E: main (in /sbin/rpc.statd)
This commit is contained in:
Brad Hubbard 2015-03-18 14:51:26 +05:30 committed by Siddhesh Poyarekar
parent f8aeae3473
commit ed6b0fe710
3 changed files with 12 additions and 8 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2015-03-18 Brad Hubbard <bhubbard@redhat.com>
[BZ #17542]
* sunrpc/svc.c (xprt_register): Use calloc to allocate xports.
2015-03-17 Alexandre Oliva <aoliva@redhat.com>
[BZ #17090]

11
NEWS
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@ -10,12 +10,11 @@ Version 2.22
* The following bugs are resolved with this release:
4719, 13064, 14094, 14841, 14906, 15319, 15467, 15790, 15969, 16351,
16512, 16560, 16783, 17090, 17269, 17523, 17569, 17588, 17620, 17621,
17628, 17631, 17711, 17776, 17779, 17792, 17836, 17912, 17916, 17932,
17944, 17949, 17964, 17965, 17967, 17969, 17978, 17987, 17991, 17996,
17998, 17999, 18019, 18020, 18029, 18030, 18032, 18036, 18038, 18039,
18042, 18043, 18046, 18047, 18068, 18080, 18093, 18104, 18110, 18111,
18128.
16512, 16560, 16783, 17269, 17523, 17542, 17569, 17588, 17631, 17711,
17776, 17779, 17792, 17836, 17912, 17916, 17932, 17944, 17949, 17964,
17965, 17967, 17969, 17978, 17987, 17991, 17996, 17998, 17999, 18019,
18020, 18029, 18030, 18032, 18036, 18038, 18039, 18042, 18043, 18046,
18047, 18068, 18080, 18093, 18104, 18110, 18111.
* Character encoding and ctype tables were updated to Unicode 7.0.0, using
new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red

4
sunrpc/svc.c
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@ -97,8 +97,8 @@ xprt_register (SVCXPRT *xprt)
if (xports == NULL)
{
xports = (SVCXPRT **) malloc (_rpc_dtablesize () * sizeof (SVCXPRT *));
if (xports == NULL) /* Don´t add handle */
xports = (SVCXPRT **) calloc (_rpc_dtablesize (), sizeof (SVCXPRT *));
if (xports == NULL) /* Don't add handle */
return;
}