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-rw-r--r--extras/ata_id/ata_id.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/extras/ata_id/ata_id.c b/extras/ata_id/ata_id.c
index 2840e91457..9579db3105 100644
--- a/extras/ata_id/ata_id.c
+++ b/extras/ata_id/ata_id.c
@@ -68,7 +68,7 @@ static void set_str(char *to, const char *from, size_t count)
/* strip trailing whitespace */
len = strnlen(from, count);
- while (isspace(from[len-1]))
+ while (len && isspace(from[len-1]))
len--;
/* strip leading whitespace */