From: Eric Dumazet Date: Sat, 12 Jul 2014 13:49:16 +0000 (+0200) Subject: net: filter: sk_chk_filter() no longer mangles filter X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=ec31a05c4dfa95149b1754d9de92831a5a95c636;p=openwrt%2Fstaging%2Fblogic.git net: filter: sk_chk_filter() no longer mangles filter Add const attribute to filter argument to make clear it is no longer modified. Signed-off-by: Eric Dumazet Acked-by: Daniel Borkmann Acked-by: Alexei Starovoitov Signed-off-by: David S. Miller --- diff --git a/include/linux/filter.h b/include/linux/filter.h index b885dcb7eaca..c43c8258e682 100644 --- a/include/linux/filter.h +++ b/include/linux/filter.h @@ -362,7 +362,7 @@ void sk_unattached_filter_destroy(struct sk_filter *fp); int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk); int sk_detach_filter(struct sock *sk); -int sk_chk_filter(struct sock_filter *filter, unsigned int flen); +int sk_chk_filter(const struct sock_filter *filter, unsigned int flen); int sk_get_filter(struct sock *sk, struct sock_filter __user *filter, unsigned int len); diff --git a/net/core/filter.c b/net/core/filter.c index 87af1e3e56c0..b90ae7fb3b89 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -1085,7 +1085,7 @@ err: * a cell if not previously written, and we check all branches to be sure * a malicious user doesn't try to abuse us. */ -static int check_load_and_stores(struct sock_filter *filter, int flen) +static int check_load_and_stores(const struct sock_filter *filter, int flen) { u16 *masks, memvalid = 0; /* One bit per cell, 16 cells */ int pc, ret = 0; @@ -1218,7 +1218,7 @@ static bool chk_code_allowed(u16 code_to_probe) * * Returns 0 if the rule set is legal or -EINVAL if not. */ -int sk_chk_filter(struct sock_filter *filter, unsigned int flen) +int sk_chk_filter(const struct sock_filter *filter, unsigned int flen) { bool anc_found; int pc; @@ -1228,7 +1228,7 @@ int sk_chk_filter(struct sock_filter *filter, unsigned int flen) /* Check the filter code now */ for (pc = 0; pc < flen; pc++) { - struct sock_filter *ftest = &filter[pc]; + const struct sock_filter *ftest = &filter[pc]; /* May we actually operate on this code? */ if (!chk_code_allowed(ftest->code))