[PATCH] malloc: Fix clobbered errno when getrandom failed [BZ #29624]

[Yu Chien Peter Lin]

The patch resets errno when getrandom syscall failed, which will
result in errno clobbered at statically linked program startup. This
scenario is possible if getrandom is called by tcache_key_initialize
when crng is not ready thus EAGAIN is returned.

Fixes bug 29624.

Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com>
---
 malloc/malloc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/malloc/malloc.c b/malloc/malloc.c
index 953183e956..21f2bf5431 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -3140,6 +3140,7 @@ tcache_key_initialize (void)
 #if __WORDSIZE == 64
       tcache_key = (tcache_key << 32) | random_bits ();
 #endif
+      __set_errno(0);
     }
 }
 
-- 
2.34.1