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commit 4969890247d7d6a548f17641ed5a18f4b713d211
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Author: Alexandre Oliva <aoliva@redhat.com>
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Date: Fri Nov 21 03:29:56 2014 -0200
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BZ#14498: fix infinite loop in nss_db_getservbyname
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nss_db uses nss_files code for services, but a continue on protocol
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mismatch that doesn't affect nss_files skipped the code that advanced
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to the next db entry. Any one of these changes would suffice to fix
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it, but fixing both makes them both safer to reuse elsewhere.
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for ChangeLog
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[BZ #14498]
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* NEWS: Fixed.
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* nss/nss_db/db-XXX.c (_nss_db_get##name##_r): Update hidx
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after parsing line but before break_if_match.
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* nss/nss_files/files-service (DB_LOOKUP): Don't "continue;"
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if there is a protocol mismatch.
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Index: b/nss/nss_db/db-XXX.c
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===================================================================
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--- a/nss/nss_db/db-XXX.c
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+++ b/nss/nss_db/db-XXX.c
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@@ -190,6 +190,12 @@ enum nss_status \
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char *p = memcpy (buffer, valstr, len); \
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\
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int err = parse_line (p, result, data, buflen, errnop EXTRA_ARGS); \
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+ \
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+ /* Advance before break_if_match, lest it uses continue to skip
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+ to the next entry. */ \
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+ if ((hidx += hval2) >= header->dbs[i].hashsize) \
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+ hidx -= header->dbs[i].hashsize; \
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+ \
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if (err > 0) \
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{ \
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status = NSS_STATUS_SUCCESS; \
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@@ -202,9 +208,6 @@ enum nss_status \
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status = NSS_STATUS_TRYAGAIN; \
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break; \
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} \
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- \
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- if ((hidx += hval2) >= header->dbs[i].hashsize) \
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- hidx -= header->dbs[i].hashsize; \
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} \
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\
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if (status == NSS_STATUS_NOTFOUND) \
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Index: b/nss/nss_files/files-service.c
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===================================================================
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--- a/nss/nss_files/files-service.c
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+++ b/nss/nss_files/files-service.c
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@@ -44,8 +44,11 @@ DB_LOOKUP (servbyname, ':',
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{
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/* Must match both protocol (if specified) and name. */
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if (proto != NULL && strcmp (result->s_proto, proto))
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- continue;
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- LOOKUP_NAME (s_name, s_aliases)
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+ /* A continue statement here breaks nss_db, because it
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+ bypasses advancing to the next db entry, and it
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+ doesn't make nss_files any more efficient. */;
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+ else
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+ LOOKUP_NAME (s_name, s_aliases)
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},
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const char *name, const char *proto)
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