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-rw-r--r--net/core/filter.c10
1 files changed, 3 insertions, 7 deletions
diff --git a/net/core/filter.c b/net/core/filter.c
index 9eb9d00..a52665f 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -287,7 +287,9 @@ load_b:
* no references or jumps that are out of range, no illegal
* instructions, and must end with a RET instruction.
*
- * Returns 0 if the rule set is legal or a negative errno code if not.
+ * All jumps are forward as they are not signed.
+ *
+ * Returns 0 if the rule set is legal or -EINVAL if not.
*/
int sk_chk_filter(struct sock_filter *filter, int flen)
{
@@ -299,7 +301,6 @@ int sk_chk_filter(struct sock_filter *filter, int flen)
/* check the filter code now */
for (pc = 0; pc < flen; pc++) {
- /* all jumps are forward as they are not signed */
ftest = &filter[pc];
/* Only allow valid instructions */
@@ -383,11 +384,6 @@ int sk_chk_filter(struct sock_filter *filter, int flen)
}
}
- /*
- * The program must end with a return. We don't care where they
- * jumped within the script (its always forwards) but in the end
- * they _will_ hit this.
- */
return (BPF_CLASS(filter[flen - 1].code) == BPF_RET) ? 0 : -EINVAL;
}
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