Messages in this thread Patch in this message | | | From | Christoph Hellwig <> | Subject | [PATCH 3/9] fs: explicitly check for CHECK_IOVEC_ONLY in rw_copy_check_uvector | Date | Fri, 18 Sep 2020 14:45:27 +0200 |
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Explicitly check for the magic value insted of implicitly relying on its number representation.
Signed-off-by: Christoph Hellwig <hch@lst.de> --- fs/read_write.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/fs/read_write.c b/fs/read_write.c index 5db58b8c78d0dd..f153116bc5399b 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -840,8 +840,7 @@ ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, ret = -EINVAL; goto out; } - if (type >= 0 - && unlikely(!access_ok(buf, len))) { + if (type != CHECK_IOVEC_ONLY && unlikely(!access_ok(buf, len))) { ret = -EFAULT; goto out; } @@ -911,7 +910,7 @@ ssize_t compat_rw_copy_check_uvector(int type, } if (len < 0) /* size_t not fitting in compat_ssize_t .. */ goto out; - if (type >= 0 && + if (type != CHECK_IOVEC_ONLY && !access_ok(compat_ptr(buf), len)) { ret = -EFAULT; goto out; -- 2.28.0
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