diff options
author | Julia Lawall <julia@diku.dk> | 2010-08-27 19:31:56 -0700 |
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committer | David S. Miller <davem@davemloft.net> | 2010-08-27 19:31:56 -0700 |
commit | c34186ed008229e7f7e3f1de8e6acf6374995358 (patch) | |
tree | b8d24a6503fc847d7dd1fa55b73aa9ca45781730 /net/ipv4/tcp_cong.c | |
parent | 7e368739e3b3f1d7944794c178a15f05829b56bc (diff) | |
download | linux-c34186ed008229e7f7e3f1de8e6acf6374995358.tar.gz |
net/ipv4: Eliminate kstrdup memory leak
The string clone is only used as a temporary copy of the argument val within the while loop, and so it should be freed before leaving the function. The call to strsep, however, modifies clone, so a pointer to the front of the string is kept in saved_clone, to make it possible to free it. The sematic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @r exists@ local idexpression x; expression E; identifier l; statement S; @@ *x= \(kasprintf\|kstrdup\)(...); ... if (x == NULL) S ... when != kfree(x) when != E = x if (...) { <... when != kfree(x) * goto l; ...> * return ...; } // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_cong.c')
-rw-r--r-- | net/ipv4/tcp_cong.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/net/ipv4/tcp_cong.c b/net/ipv4/tcp_cong.c index 0ec9bd0ae94f..850c737e08e2 100644 --- a/net/ipv4/tcp_cong.c +++ b/net/ipv4/tcp_cong.c @@ -196,10 +196,10 @@ void tcp_get_allowed_congestion_control(char *buf, size_t maxlen) int tcp_set_allowed_congestion_control(char *val) { struct tcp_congestion_ops *ca; - char *clone, *name; + char *saved_clone, *clone, *name; int ret = 0; - clone = kstrdup(val, GFP_USER); + saved_clone = clone = kstrdup(val, GFP_USER); if (!clone) return -ENOMEM; @@ -226,6 +226,7 @@ int tcp_set_allowed_congestion_control(char *val) } out: spin_unlock(&tcp_cong_list_lock); + kfree(saved_clone); return ret; } |