evie/android_kernel_oneplus_msm8998
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sg_start_req(): use import_iovec()

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2015-03-21 20:25:30 -04:00
parent 451a2886b6
commit fdc81f45e9
1 changed files with 5 additions and 11 deletions
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16
drivers/scsi/sg.c
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@ -1744,21 +1744,15 @@ sg_start_req(Sg_request *srp, unsigned char *cmd)
md->from_user = 0; md->from_user = 0;
} }
if (unlikely(iov_count > MAX_UIOVEC))
return -EINVAL;
if (iov_count) { if (iov_count) {
int size = sizeof(struct iovec) * iov_count; struct iovec *iov = NULL;
struct iovec *iov;
struct iov_iter i; struct iov_iter i;
iov = memdup_user(hp->dxferp, size); res = import_iovec(rw, hp->dxferp, iov_count, 0, &iov, &i);
if (IS_ERR(iov)) if (res < 0)
return PTR_ERR(iov); return res;
iov_iter_init(&i, rw, iov, iov_count, iov_iter_truncate(&i, hp->dxfer_len);
min_t(size_t, hp->dxfer_len,
iov_length(iov, iov_count)));
res = blk_rq_map_user_iov(q, rq, md, &i, GFP_ATOMIC); res = blk_rq_map_user_iov(q, rq, md, &i, GFP_ATOMIC);
kfree(iov); kfree(iov);