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authorVakul Garg <vakul.garg@nxp.com>2018-12-21 15:16:52 +0000
committerDavid S. Miller <davem@davemloft.net>2018-12-21 10:26:54 -0800
commit65a10e28aee72903a41670170cd5330ad73c490e (patch)
tree2d84674e27f79bdc7cabcfb63167db3edf892b72 /net/tls
parentcbb49697d5512ce9e61b45ce75d3ee43d7ea5524 (diff)
downloadlinux-65a10e28aee72903a41670170cd5330ad73c490e.tar.bz2
tls: Do not call sk_memcopy_from_iter with zero length
In some conditions e.g. when tls_clone_plaintext_msg() returns -ENOSPC, the number of bytes to be copied using subsequent function sk_msg_memcopy_from_iter() becomes zero. This causes function sk_msg_memcopy_from_iter() to fail which in turn causes tls_sw_sendmsg() to return failure. To prevent it, do not call sk_msg_memcopy_from_iter() when number of bytes to copy (indicated by 'try_to_copy') is zero. Fixes: d829e9c4112b ("tls: convert to generic sk_msg interface") Signed-off-by: Vakul Garg <vakul.garg@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/tls')
-rw-r--r--net/tls/tls_sw.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
index 7b1af8b59cd2..29b27858fff1 100644
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -935,10 +935,12 @@ fallback_to_reg_send:
tls_ctx->tx.overhead_size);
}
- ret = sk_msg_memcopy_from_iter(sk, &msg->msg_iter, msg_pl,
- try_to_copy);
- if (ret < 0)
- goto trim_sgl;
+ if (try_to_copy) {
+ ret = sk_msg_memcopy_from_iter(sk, &msg->msg_iter,
+ msg_pl, try_to_copy);
+ if (ret < 0)
+ goto trim_sgl;
+ }
/* Open records defined only if successfully copied, otherwise
* we would trim the sg but not reset the open record frags.