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iov_iter: fix the uaccess area in copy_compat_iovec_from_user 

sizeof needs to be called on the compat pointer, not the native one.

Fixes: 89cd35c58b ("iov_iter: transparently handle compat iovecs in import_iovec")
Reported-by: David Laight <David.Laight@ACULAB.COM>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig 2021-01-11 18:19:26 +01:00 committed by Al Viro
parent a0a6df9afc
commit a959a9782f
1 changed files with 1 additions and 1 deletions
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lib/iov_iter.c
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@ -1658,7 +1658,7 @@ static int copy_compat_iovec_from_user(struct iovec *iov,
(const struct compat_iovec __user *)uvec;
int ret = -EFAULT, i;
if (!user_access_begin(uvec, nr_segs * sizeof(*uvec)))
if (!user_access_begin(uiov, nr_segs * sizeof(*uiov)))
return -EFAULT;
for (i = 0; i < nr_segs; i++) {