From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Fri, 14 Apr 2023 11:22:40 +0000 (-0300)
Subject: malloc: Assure that THP mode read do write OOB end of stringt
X-Git-Tag: glibc-2.38~374
X-Git-Url: https://sourceware.org/git/?a=commitdiff_plain;h=05fe3ecffff485032e904f0a3ea709e24d9188eb;p=glibc.git

malloc: Assure that THP mode read do write OOB end of stringt
---

diff --git a/sysdeps/unix/sysv/linux/malloc-hugepages.c b/sysdeps/unix/sysv/linux/malloc-hugepages.c
index 740027ebfb..2f316474c1 100644
--- a/sysdeps/unix/sysv/linux/malloc-hugepages.c
+++ b/sysdeps/unix/sysv/linux/malloc-hugepages.c
@@ -61,6 +61,8 @@ __malloc_thp_mode (void)
 
   char str[sizeof(mode_always)];
   ssize_t s = __read_nocancel (fd, str, sizeof (str));
+  if (s >= sizeof str || s < 0)
+    return malloc_thp_mode_not_supported;
   str[s] = '\0';
   __close_nocancel (fd);