[dpdk-dev] vhost: fix unchecked return value of fstat
Commit Message
Value returned from fstat is not checked for errors before being used.
Fixes the coverity issue:
static uint64_t
get_blk_size(int fd)
{
struct stat stat;
fstat(fd, &stat);
return (uint64_t)stat.st_blksize;
>>> CID 107103 (#1 of 1): Unchecked return value from library (CHECKED_RETURN)
>>> check_return: Calling fstat(fd, &stat) without checking return value.
>>> This library function may fail and return an error code.
Fixes: 8f972312b8f4 ("vhost: support vhost-user")
Signed-off-by: Huawei Xie <huawei.xie@intel.com>
---
lib/librte_vhost/vhost_user/virtio-net-user.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
Comments
On Wed, Jun 15, 2016 at 01:45:23AM +0800, Huawei Xie wrote:
> Value returned from fstat is not checked for errors before being used.
> Fixes the coverity issue:
>
> static uint64_t
> get_blk_size(int fd)
> {
> struct stat stat;
>
> fstat(fd, &stat);
> return (uint64_t)stat.st_blksize;
> >>> CID 107103 (#1 of 1): Unchecked return value from library (CHECKED_RETURN)
> >>> check_return: Calling fstat(fd, &stat) without checking return value.
> >>> This library function may fail and return an error code.
>
> Fixes: 8f972312b8f4 ("vhost: support vhost-user")
>
> Signed-off-by: Huawei Xie <huawei.xie@intel.com>
Acked-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Applied to dpdk-next-virtio. Thanks.
--yliu
@@ -64,9 +64,10 @@ static uint64_t
get_blk_size(int fd)
{
struct stat stat;
+ int ret;
- fstat(fd, &stat);
- return (uint64_t)stat.st_blksize;
+ ret = fstat(fd, &stat);
+ return ret == -1 ? (uint64_t)-1 : (uint64_t)stat.st_blksize;
}
static void
@@ -162,6 +163,11 @@ user_set_mem_table(struct vhost_device_ctx ctx, struct VhostUserMsg *pmsg)
* aligned.
*/
alignment = get_blk_size(pmsg->fds[idx]);
+ if (alignment == (uint64_t)-1) {
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "couldn't get hugepage size through fstat\n");
+ goto err_mmap;
+ }
mapped_size = RTE_ALIGN_CEIL(mapped_size, alignment);
mapped_address = (uint64_t)(uintptr_t)mmap(NULL,