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IB/uverbs: Fix reading of 32 bit flags

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This is missing a zeroing of the high bits of flags, and is also not
correct for big endian machines. Properly zero extend the 32 bit flags
into the 64 bit stack variable.

Reported-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Fixes: bccd06223f ("IB/uverbs: Add UVERBS_ATTR_FLAGS_IN to the specs language")
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
This commit is contained in:
Jason Gunthorpe 2018-08-09 19:19:35 +03:00
parent 61b717d041
commit 922983c2a1
1 changed files with 1 additions and 1 deletions
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2
drivers/infiniband/core/uverbs_ioctl.c
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@ -535,7 +535,7 @@ int uverbs_get_flags64(u64 *to, const struct uverbs_attr_bundle *attrs_bundle,
if (attr->ptr_attr.len == 8)
flags = attr->ptr_attr.data;
else if (attr->ptr_attr.len == 4)
memcpy(&flags, &attr->ptr_attr.data, 4);
flags = *(u32 *)&attr->ptr_attr.data;
else
return -EINVAL;