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| author | Florian Weimer <fweimer@redhat.com> | 2016-06-11 12:12:56 +0200 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2016-08-18 13:02:45 +0200 |
| commit | 79ad3fa2b1f38997be255d4eb709da928b66796a (patch) | |
| tree | ccc5a5003a55ab1a44ab9c698495d0a8e0572f91 | |
| parent | 395b1b9cbfda75fcdef0a9654d7ef6bf8bf7db11 (diff) | |
| download | glibc-79ad3fa2b1f38997be255d4eb709da928b66796a.tar.gz glibc-79ad3fa2b1f38997be255d4eb709da928b66796a.tar.xz glibc-79ad3fa2b1f38997be255d4eb709da928b66796a.zip | |
nss_db: Fix initialization of iteration position [BZ #20237]
When get*ent is called without a preceding set*ent, we need to set the initial iteration position in get*ent. Reproducer: Add “services: db files” to /etc/nsswitch.conf, then run “perl -e getservent”. It will segfault before this change, and exit silently after it. (cherry picked from commit 31d0a4fa646db8b8c97ce24e0ec0a7b73de4fca1)
| -rw-r--r-- | ChangeLog | 7 | ||||
| -rw-r--r-- | nss/nss_db/db-XXX.c | 8 |
2 files changed, 14 insertions, 1 deletions
diff --git a/ChangeLog b/ChangeLog index 5b73777edf..ac57570aba 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,10 @@ +2016-06-11 Florian Weimer <fweimer@redhat.com> + + [BZ #20237] + * nss/nss_db/db-XXX.c (set*ent): Reset entidx to NULL. + (get*ent): Set entidx to NULL during initialization. If entidx is + NULL, start iteration from the beginning. + 2016-06-30 Andreas Schwab <schwab@suse.de> [BZ #20262] diff --git a/nss/nss_db/db-XXX.c b/nss/nss_db/db-XXX.c index 125a5e9b12..2d13edda27 100644 --- a/nss/nss_db/db-XXX.c +++ b/nss/nss_db/db-XXX.c @@ -77,7 +77,7 @@ CONCAT(_nss_db_set,ENTNAME) (int stayopen) keep_db |= stayopen; /* Reset the sequential index. */ - entidx = (const char *) state.header + state.header->valstroffset; + entidx = NULL; } __libc_lock_unlock (lock); @@ -253,8 +253,14 @@ CONCAT(_nss_db_get,ENTNAME_r) (struct STRUCTURE *result, char *buffer, H_ERRNO_SET (NETDB_INTERNAL); goto out; } + entidx = NULL; } + /* Start from the beginning if freshly initialized or reset + requested by set*ent. */ + if (entidx == NULL) + entidx = (const char *) state.header + state.header->valstroffset; + status = NSS_STATUS_UNAVAIL; if (state.header != MAP_FAILED) { |