diff mbox series

[v3,1/2] raw/ifpga: terminate string filled by readlink with null

Message ID 1604043307-20730-2-git-send-email-wei.huang@intel.com (mailing list archive)
State Accepted, archived
Delegated to: Qi Zhang
Headers
Series raw/ifpga: fix coverity defects |

Checks

Context Check Description
ci/checkpatch success coding style OK

Commit Message

Wei Huang Oct. 30, 2020, 7:35 a.m. UTC 
  readlink() does not terminate string, add a null character at the end
of the string if readlink() succeeds.

Coverity issue: 362820
Fixes: 9c006c45d0c5 ("raw/ifpga: scan PCIe BDF device tree")

Signed-off-by: Wei Huang <wei.huang@intel.com>
---
v2: fix coding style issue
v3: add coverity issue number
---
 drivers/raw/ifpga/ifpga_rawdev.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/raw/ifpga/ifpga_rawdev.c b/drivers/raw/ifpga/ifpga_rawdev.c
index 0385514..f9de167 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 int)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);