[glibc] hugepages: close fd on error path in __get_thp_mode

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=ddd5c8b0b477420ea2c4ff4cadd2a9c9521f437b

commit ddd5c8b0b477420ea2c4ff4cadd2a9c9521f437b
Author: Shamil Abdulaev <[email protected]>
Date:   Thu Apr 30 02:37:39 2026 +0300

    hugepages: close fd on error path in __get_thp_mode
    
    If __read_nocancel fails or overflows the buffer, the function returned
    without closing the /sys/kernel/mm/transparent_hugepage/enabled fd.
    
    Found while investigating BZ #34083.
    
    Signed-off-by: Shamil Abdulaev <[email protected]>
    Reviewed-by: H.J. Lu <[email protected]>

Diff:
---
 sysdeps/unix/sysv/linux/hugepages.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sysdeps/unix/sysv/linux/hugepages.c b/sysdeps/unix/sysv/linux/hugepages.c
index 707a75c2a2..46e05151a3 100644
--- a/sysdeps/unix/sysv/linux/hugepages.c
+++ b/sysdeps/unix/sysv/linux/hugepages.c
@@ -61,10 +61,10 @@ __get_thp_mode (void)
 
   char str[sizeof(mode_always)];
   ssize_t s = __read_nocancel (fd, str, sizeof (str));
+  __close_nocancel (fd);
   if (s >= sizeof str || s < 0)
     return thp_mode_not_supported;
   str[s] = '\0';
-  __close_nocancel (fd);
 
   if (s == sizeof (mode_always) - 1)
     {