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platform: avoid valgrind warning about uninitialised memory in _ioctl_call()

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==6207== Syscall param ioctl(SIOCETHTOOL) points to uninitialised byte(s)
==6207==    at 0x514603B: ioctl (syscall-template.S:78)
==6207==    by 0x19FC2F: _ioctl_call (nm-platform-utils.c:183)
==6207==    by 0x1A026B: _ethtool_call_handle (nm-platform-utils.c:319)
==6207==    by 0x1A031F: ethtool_get_stringset (nm-platform-utils.c:378)
==6207==    by 0x1A03BC: ethtool_get_stringset_index (nm-platform-utils.c:414)
==6207==    by 0x1A181E: nmp_utils_ethtool_supports_vlans (nm-platform-utils.c:912)
==6207==    by 0x1756D7: link_supports_vlans (nm-linux-platform.c:6508)
==6207==    by 0x1A81D8: nm_platform_link_supports_vlans (nm-platform.c:1536)
==6207==    by 0x14B96B: test_internal (test-link.c:602)
==6207==    by 0x4F5C18D: test_case_run (gtestutils.c:2597)
==6207==    by 0x4F5C18D: g_test_run_suite_internal (gtestutils.c:2685)
==6207==    by 0x4F5BF33: g_test_run_suite_internal (gtestutils.c:2697)
==6207==    by 0x4F5C679: g_test_run_suite (gtestutils.c:2772)
==6207==    by 0x4F5C694: g_test_run (gtestutils.c:2007)
==6207==    by 0x166B4D: main (test-common.c:2092)
==6207==  Address 0x1ffeffeecf is on thread 1's stack
==6207==  in frame #1, created by _ioctl_call (nm-platform-utils.c:110)
==6207==

"ifname" is the stack-allocated array "known_ifnames" of suitable
IFNAMSIZ bytes. But it may not be fully initialized, so using memcpy()
to copy the string leads to unintialized warning.

We really should only copy the valid bytes, either with strcpy() or our
nm_utils_ifname_cpy() wrapper.

Fixes: 856322562e ('platform/ethtool,mii: retry ioctl when interface name was renamed for ehttool/mii')
This commit is contained in:
Thomas Haller 2019-05-16 10:11:39 +02:00
parent 065d891402
commit e9c76f375b
1 changed files with 1 additions and 1 deletions
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2
src/platform/nm-platform-utils.c
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@ -174,7 +174,7 @@ again:
nm_assert (fd >= 0);
memset (&ifr, 0, sizeof (ifr));
memcpy (ifr.ifr_name, ifname, IFNAMSIZ);
nm_utils_ifname_cpy (ifr.ifr_name, ifname);
if (edata_type == IOCTL_CALL_DATA_TYPE_IFRDATA)
ifr.ifr_data = edata;
else if (edata_type == IOCTL_CALL_DATA_TYPE_IFRU)