GNU C Library master sources branch gentoo/2.23 updated. glibc-2.23-81-g1ad4b42

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      from  f7076e089854bbbce413dd9a832d3f39515d0d45 (commit)

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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=1ad4b4277f6f9c9c1d124357ab19d26dee61eb80

commit 1ad4b4277f6f9c9c1d124357ab19d26dee61eb80
Author: Florian Weimer <fweimer@redhat.com>
Date:   Sat Jun 11 12:12:56 2016 +0200

    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 â??services: db filesâ?? to /etc/nsswitch.conf, then run
    â??perl -e getserventâ??.  It will segfault before this change, and exit
    silently after it.
    
    (cherry picked from commit 31d0a4fa646db8b8c97ce24e0ec0a7b73de4fca1)
    (cherry picked from commit 79ad3fa2b1f38997be255d4eb709da928b66796a)

diff --git a/nss/nss_db/db-XXX.c b/nss/nss_db/db-XXX.c
index 125a5e9..2d13edd 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)
     {

-----------------------------------------------------------------------

Summary of changes:
 nss/nss_db/db-XXX.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)


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