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mm: mremap: fix sign for EFAULT error return value 

commit 7d1e649661 upstream.

The mremap syscall is supposed to return a pointer to the new virtual
memory area on success, and a negative value of the error code in case of
failure.  Currently, EFAULT is returned when the VMA is not found, instead
of -EFAULT.  The users of this syscall will therefore believe the syscall
succeeded in case the VMA didn't exist, as it returns a pointer to address
0xe (0xe being the value of EFAULT).  Fix the sign of the error value.

Link: https://lkml.kernel.org/r/20220427224439.23828-2-dossche.niels@gmail.com
Fixes: 550a7d60bd ("mm, hugepages: add mremap() support for hugepage backed vma")
Signed-off-by: Niels Dossche <dossche.niels@gmail.com>
Cc: Mina Almasry <almasrymina@google.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Niels Dossche 2022-05-09 17:34:28 -07:00 committed by Greg Kroah-Hartman
parent 13d9b8cd12
commit f6fd9552ef
1 changed files with 1 additions and 1 deletions
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2
mm/mremap.c
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@ -947,7 +947,7 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len,
return -EINTR;
vma = find_vma(mm, addr);
if (!vma || vma->vm_start > addr) {
ret = EFAULT;
ret = -EFAULT;
goto out;
}