[glibc/nsz/bug19329-v2] elf: Fix a DTV setup issue [BZ #27136]

[glibc/nsz/bug19329-v2] elf: Fix a DTV setup issue [BZ #27136]

[Szabolcs Nagy]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=e2a6e000b123c4e5ddacfce1511a364b509b9ea1

commit e2a6e000b123c4e5ddacfce1511a364b509b9ea1
Author: Szabolcs Nagy <szabolcs.nagy@arm.com>
Date:   Wed Dec 30 23:40:14 2020 +0000

    elf: Fix a DTV setup issue [BZ #27136]
    
    The max modid is a valid index in the dtv, it should not be skipped.
    
    The bug is observable if the last module has modid == 64 and its
    generation is same or less than the max generation of the previous
    modules.  Then dtv[0].counter implies dtv[64] is initialized but
    it isn't. Fixes bug 27136.
    
    Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

Diff:
---
 elf/dl-tls.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/elf/dl-tls.c b/elf/dl-tls.c
index dd76829e74..79b93ad91b 100644
--- a/elf/dl-tls.c
+++ b/elf/dl-tls.c
@@ -590,7 +590,7 @@ _dl_allocate_tls_init (void *result)
 	}
 
       total += cnt;
-      if (total >= GL(dl_tls_max_dtv_idx))
+      if (total > GL(dl_tls_max_dtv_idx))
 	break;
 
       listp = listp->next;