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-rw-r--r--sbin/atacontrol/atacontrol.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/sbin/atacontrol/atacontrol.c b/sbin/atacontrol/atacontrol.c
index 4161af8..dbcb81f 100644
--- a/sbin/atacontrol/atacontrol.c
+++ b/sbin/atacontrol/atacontrol.c
@@ -197,6 +197,9 @@ ata_cap_print(int fd, int channel, int device)
{
struct ata_cmd iocmd;
+ if (device < 0 || device > 1)
+ return ENXIO;
+
bzero(&iocmd, sizeof(struct ata_cmd));
iocmd.channel = channel;
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