[RFC 7/8] eal: add check for sysfs path overflow

[Stephen Hemminger <stephen@networkplumber.org>]

It shouldn't happen but in theory sysfs socket could overflow.
Add a check for it.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 lib/eal/linux/eal_hugepage_info.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/eal/linux/eal_hugepage_info.c b/lib/eal/linux/eal_hugepage_info.c
index 7161b1a2fb..fe3351259e 100644
--- a/lib/eal/linux/eal_hugepage_info.c
+++ b/lib/eal/linux/eal_hugepage_info.c
@@ -150,8 +150,12 @@ get_num_hugepages_on_node(const char *subdir, unsigned int socket, size_t sz)
 		return 0;
 	}
 
-	snprintf(path, sizeof(path), "%s/%s/%s",
+	if (snprintf(path, sizeof(path), "%s/%s/%s", socketpath, subdir, nr_hp_file) >= PATH_MAX) {
+		EAL_LOG(NOTICE, "Socket path %s/%s/%s is truncated",
 			socketpath, subdir, nr_hp_file);
+		return 0;
+	}
+
 	if (eal_parse_sysfs_value(path, &num_pages) < 0)
 		return 0;
 
-- 
2.51.0