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mm: mremap: fix sign for EFAULT error return value
commit7d1e649661
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>
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@ -947,7 +947,7 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len,
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return -EINTR;
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vma = find_vma(mm, addr);
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if (!vma || vma->vm_start > addr) {
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ret = EFAULT;
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ret = -EFAULT;
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goto out;
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}
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