On 20 February 2014 02:49, Gui Hecheng <guihc.fnst@xxxxxxxxxxxxxx> wrote: > When exec btrfs-debug-tree as non-root user, we get a segment fault. > Because the btrfs_scan_block_devices return a success 0 when we fail > to open a device. Now we just return the errno if this case happens. > > Signed-off-by: Gui Hecheng <guihc.fnst@xxxxxxxxxxxxxx> > --- > utils.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/utils.c b/utils.c > index 97e23d5..1878abc 100644 > --- a/utils.c > +++ b/utils.c > @@ -1517,7 +1517,8 @@ scan_again: > scans++; > goto scan_again; > } > - return 0; > + > + return errno ? -errno : 0; > } > > u64 parse_size(char *s) > -- > 1.8.1.4 Hi Gui, This strikes me as not not right because errno is only documented as being set when open() returns -1 on failure. In the success case errno is not set so you can't assume it will be 0. I think the following might work: 1) Initilase ret = 0 at the start of btrfs_scan_block_devices() 2) In the open(fullpath, O_RDONLY) failure case set ret = fd 3) return ret Thanks, Mike -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
