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authorCorey Minyard <minyard@acm.org>2014-01-22 03:48:44 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2014-01-22 04:19:42 +0400
commit4e4f9e66a75921aa260c2f5bf626bdea54e51ba2 (patch)
tree90c9fe3508062f8056b727aaff577d444f6b55e9 /fs/read_write.c
parent38316c8ab7f17bc1be8f2898278d5f5131e18bf2 (diff)
downloadlinux-4e4f9e66a75921aa260c2f5bf626bdea54e51ba2.tar.xz
fs/read_write.c:compat_readv(): remove bogus area verify
The compat_do_readv_writev() function was doing a verify_area on the incoming iov, but the nr_segs value is not checked. If someone passes in a -1 for nr_segs, for instance, the function should return an EINVAL. However, it returns a EFAULT because the verify_area fails because it is checking an array of size MAX_UINT. The check is bogus, anyway, because the next check, compat_rw_copy_check_uvector(), will do all the necessary checking, anyway. The non-compat do_readv_writev() function doesn't do this check, so I think it's safe to just remove the code. Signed-off-by: Corey Minyard <cminyard@mvista.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/read_write.c')
-rw-r--r--fs/read_write.c4
1 files changed, 0 insertions, 4 deletions
diff --git a/fs/read_write.c b/fs/read_write.c
index 58e440df1bc6..1193ffd03565 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -901,10 +901,6 @@ static ssize_t compat_do_readv_writev(int type, struct file *file,
io_fn_t fn;
iov_fn_t fnv;
- ret = -EFAULT;
- if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
- goto out;
-
ret = compat_rw_copy_check_uvector(type, uvector, nr_segs,
UIO_FASTIOV, iovstack, &iov);
if (ret <= 0)