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| author | Wenwen Wang <wenwen@cs.uga.edu> | 2019-07-20 07:22:45 -0500 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2019-07-21 21:00:15 +0200 |
| commit | 15a78ba1844a8e052c1226f930133de4cef4e7ad (patch) | |
| tree | 7ef9cb562bad41a368b7ae9b8052e00ada3c5a39 /net/bridge | |
| parent | 0cea0e1148fe134a4a3aaf0b1496f09241fb943a (diff) | |
| download | linux-15a78ba1844a8e052c1226f930133de4cef4e7ad.tar.gz linux-15a78ba1844a8e052c1226f930133de4cef4e7ad.tar.bz2 linux-15a78ba1844a8e052c1226f930133de4cef4e7ad.zip | |
netfilter: ebtables: fix a memory leak bug in compat
In compat_do_replace(), a temporary buffer is allocated through vmalloc()
to hold entries copied from the user space. The buffer address is firstly
saved to 'newinfo->entries', and later on assigned to 'entries_tmp'. Then
the entries in this temporary buffer is copied to the internal kernel
structure through compat_copy_entries(). If this copy process fails,
compat_do_replace() should be terminated. However, the allocated temporary
buffer is not freed on this path, leading to a memory leak.
To fix the bug, free the buffer before returning from compat_do_replace().
Signed-off-by: Wenwen Wang <wenwen@cs.uga.edu>
Reviewed-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/bridge')
| -rw-r--r-- | net/bridge/netfilter/ebtables.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c index 963dfdc14827..fd84b48e48b5 100644 --- a/net/bridge/netfilter/ebtables.c +++ b/net/bridge/netfilter/ebtables.c @@ -2261,8 +2261,10 @@ static int compat_do_replace(struct net *net, void __user *user, state.buf_kern_len = size64; ret = compat_copy_entries(entries_tmp, tmp.entries_size, &state); - if (WARN_ON(ret < 0)) + if (WARN_ON(ret < 0)) { + vfree(entries_tmp); goto out_unlock; + } vfree(entries_tmp); tmp.entries_size = size64; |