debugfs: avoid undefined bit shift in parse_uint()

The case is one that should never happen (and indicates a bug if it
does), but in that case, we should still avoid an undefiniced C
expression.

Fixes-Coverity-Bug: 1297494
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/debugfs/set_fields.c b/debugfs/set_fields.c
index 117cfb8..6594906 100644 (file)
--- a/debugfs/set_fields.c
+++ b/debugfs/set_fields.c
@@ -495,7 +495,7 @@ static errcode_t parse_uint(struct field_set_info *info, char *field,
        }
        if (!field2)
                return 0;
-       n = num >> (size*8);
+       n = (size == 8) ? 0 : (num >> (size*8));
        u.ptr8 = (__u8 *) field2;
        if (info->size == 6)
                size = 2;