commit 05c83ccaf50aef2dd30d92cbb814383f6bddea2c

Author: Gleb Fotengauer-Malinovskiy <glebfm@altlinux.org>

Date:   Tue Feb 1 22:39:02 2022 +0000

    linux: __get_nprocs_sched: do not feed CPU_COUNT_S with garbage [BZ #28850]

    Pass the actual number of bytes returned by the kernel.

    Fixes: 33099d72e41c ("linux: Simplify get_nprocs")

    Reviewed-by: Dmitry V. Levin <ldv@altlinux.org>

    (cherry picked from commit 97ba273b505763325efd802dc3a9562dbba79579)

diff --git a/sysdeps/unix/sysv/linux/getsysstats.c b/sysdeps/unix/sysv/linux/getsysstats.c

index 7fc6521942e87293..7babd947aa902e77 100644

--- a/sysdeps/unix/sysv/linux/getsysstats.c

+++ b/sysdeps/unix/sysv/linux/getsysstats.c

@@ -45,7 +45,7 @@ __get_nprocs_sched (void)

   int r = INTERNAL_SYSCALL_CALL (sched_getaffinity, 0, cpu_bits_size,

 				 cpu_bits);

   if (r > 0)

-    return CPU_COUNT_S (cpu_bits_size, (cpu_set_t*) cpu_bits);

+    return CPU_COUNT_S (r, (cpu_set_t*) cpu_bits);

   else if (r == -EINVAL)

     /* The input buffer is still not enough to store the number of cpus.  This

        is an arbitrary values assuming such systems should be rare and there