readlink() does not terminate string, add a null character at the end
of the string if readlink() succeeds.
Fixes: 9c006c45d0c5 ("raw/ifpga: scan PCIe BDF device tree")
Signed-off-by: Wei Huang <wei.hu...@intel.com>
---
drivers/raw/ifpga/ifpga_rawdev.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/raw/ifpga/ifpga_rawdev.c b/drivers/raw/ifpga/ifpga_rawdev.c
index 0385514..bf0613e 100644
--- a/drivers/raw/ifpga/ifpga_rawdev.c
+++ b/drivers/raw/ifpga/ifpga_rawdev.c
@@ -230,8 +230,9 @@ static int ifpga_rawdev_fill_info(struct ifpga_rawdev
*ifpga_dev,
memset(link, 0, sizeof(link));
memset(link1, 0, sizeof(link1));
ret = readlink(path, link, (sizeof(link)-1));
- if (ret == -1)
+ if ((ret < 0) || ((unsigned)ret > (sizeof(link)-1)))
return -1;
+ link[ret] = 0; /* terminate string with null character */
strlcpy(link1, link, sizeof(link1));
memset(ifpga_dev->parent_bdf, 0, 16);
point = strlen(link);
--
2.7.3
