From 87536a81e1f52409b45333ce8cac415a1218163c Mon Sep 17 00:00:00 2001 From: Nikolay Aleksandrov Date: Fri, 7 Mar 2014 12:44:18 +0100 Subject: [PATCH] net: af_key: fix sleeping under rcu There's a kmalloc with GFP_KERNEL in a helper (pfkey_sadb2xfrm_user_sec_ctx) used in pfkey_compile_policy which is called under rcu_read_lock. Adjust pfkey_sadb2xfrm_user_sec_ctx to have a gfp argument and adjust the users. CC: Dave Jones CC: Steffen Klassert CC: Fan Du CC: David S. Miller Signed-off-by: Nikolay Aleksandrov Signed-off-by: Steffen Klassert --- net/key/af_key.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/net/key/af_key.c b/net/key/af_key.c index 1a04c1329362..1526023f99ed 100644 --- a/net/key/af_key.c +++ b/net/key/af_key.c @@ -433,12 +433,13 @@ static inline int verify_sec_ctx_len(const void *p) return 0; } -static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx) +static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx, + gfp_t gfp) { struct xfrm_user_sec_ctx *uctx = NULL; int ctx_size = sec_ctx->sadb_x_ctx_len; - uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL); + uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp); if (!uctx) return NULL; @@ -1124,7 +1125,7 @@ static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net, sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; if (sec_ctx != NULL) { - struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); + struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); if (!uctx) goto out; @@ -2231,7 +2232,7 @@ static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_ sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; if (sec_ctx != NULL) { - struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); + struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); if (!uctx) { err = -ENOBUFS; @@ -2335,7 +2336,7 @@ static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sa sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; if (sec_ctx != NULL) { - struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); + struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); if (!uctx) return -ENOMEM; @@ -3239,7 +3240,7 @@ static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt, } if ((*dir = verify_sec_ctx_len(p))) goto out; - uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); + uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC); *dir = security_xfrm_policy_alloc(&xp->security, uctx); kfree(uctx); -- 2.20.1