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gnu: guile-ssh: Fix potential double-free/use-after-free issue.

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Fixes <http://bugs.gnu.org/26976>.
Reported by Mark H Weaver <mhw@netris.org>.

* gnu/packages/patches/guile-ssh-double-free.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/ssh.scm (guile-ssh)[source](patches): Add it.
This commit is contained in:
Ludovic Courtès 2017-05-19 10:50:20 +02:00
parent 4ee6584cbf
commit c383dc520f
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3 changed files with 40 additions and 1 deletions
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37
gnu/packages/patches/guile-ssh-double-free.patch Normal file
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@ -0,0 +1,37 @@
Fix a double-free or use-after-free issue with Guile-SSH used
with Guile 2.2. See <https://bugs.gnu.org/26976>.
diff --git a/libguile-ssh/channel-type.c b/libguile-ssh/channel-type.c
index 3dd641f..0839854 100644
--- a/libguile-ssh/channel-type.c
+++ b/libguile-ssh/channel-type.c
@@ -229,10 +229,11 @@ ptob_close (SCM channel)
ssh_channel_free (ch->ssh_channel);
}
+ SCM_SETSTREAM (channel, NULL);
+
#if USING_GUILE_BEFORE_2_2
scm_gc_free (pt->write_buf, pt->write_buf_size, "port write buffer");
scm_gc_free (pt->read_buf, pt->read_buf_size, "port read buffer");
- SCM_SETSTREAM (channel, NULL);
return 0;
#endif
diff --git a/libguile-ssh/sftp-file-type.c b/libguile-ssh/sftp-file-type.c
index 8879924..f87cf03 100644
--- a/libguile-ssh/sftp-file-type.c
+++ b/libguile-ssh/sftp-file-type.c
@@ -224,10 +224,11 @@ ptob_close (SCM sftp_file)
sftp_close (fd->file);
}
+ SCM_SETSTREAM (sftp_file, NULL);
+
#if USING_GUILE_BEFORE_2_2
scm_gc_free (pt->write_buf, pt->write_buf_size, "port write buffer");
scm_gc_free (pt->read_buf, pt->read_buf_size, "port read buffer");
- SCM_SETSTREAM (sftp_file, NULL);
return 1;
#endif