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65 lines
2.3 KiB
Diff
65 lines
2.3 KiB
Diff
commit f88759ea9bd3c8d8fef28f123ba9767cb0e421a3
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Author: Joseph Myers <joseph@codesourcery.com>
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Date: Wed Dec 21 23:44:01 2016 +0000
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Fix nss_nisplus build with mainline GCC (bug 20978).
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glibc build with current mainline GCC fails because
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nis/nss_nisplus/nisplus-alias.c contains code
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if (name != NULL)
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{
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*errnop = EINVAL;
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return NSS_STATUS_UNAVAIL;
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}
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char buf[strlen (name) + 9 + tablename_len];
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producing an error about strlen being called on a pointer that is
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always NULL (and a subsequent use of that pointer with a %s format in
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snprintf).
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As Andreas noted, the bogus conditional comes from a 1997 change:
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- if (name == NULL || strlen(name) > 8)
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- return NSS_STATUS_NOTFOUND;
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- else
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+ if (name != NULL || strlen(name) <= 8)
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So the intention is clearly to return an error for NULL name.
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This patch duly inverts the sense of the conditional. It fixes the
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build with GCC mainline, and passes usual glibc testsuite testing for
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x86_64. However, I have not tried any actual substantive nisplus
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testing, do not have an environment for such testing, and do not know
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whether it is possible that strlen (name) or tablename_len might be
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large so that the VLA for buf is actually a security issue. However,
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if it is a security issue, there are plenty of other similar instances
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in the nisplus code (that haven't been hidden by a bogus comparison
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with NULL) - and nis_table.c:__create_ib_request uses strdupa on the
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string passed to nis_list, so a local fix in the caller wouldn't
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suffice anyway (see bug 20987). (Calls to strdupa and other such
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macros that use alloca must be considered equally questionable
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regarding stack overflow issues as direct calls to alloca and VLA
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declarations.)
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[BZ #20978]
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* nis/nss_nisplus/nisplus-alias.c (_nss_nisplus_getaliasbyname_r):
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Compare name == NULL, not name != NULL.
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---
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nis/nss_nisplus/nisplus-alias.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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--- a/nis/nss_nisplus/nisplus-alias.c
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+++ b/nis/nss_nisplus/nisplus-alias.c
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@@ -293,7 +293,7 @@
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return status;
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}
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- if (name != NULL)
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+ if (name == NULL)
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{
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*errnop = EINVAL;
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return NSS_STATUS_UNAVAIL;
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