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From 45f3c8e04093a1ed871eb67aa4c1c28b11d3346c Mon Sep 17 00:00:00 2001
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From: Jan Synacek <jan.synacek@gmail.com>
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Date: Tue, 3 Jan 2017 21:34:36 +0100
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Subject: [PATCH] shared: fix double free in unmask (#5005)
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Easily reproducible:
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1) systemctl mask foo
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2) systemctl unmask foo foo
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The problem here is that the *i that is put into todo[] is later freed
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in strv_uniq(), which is not directly visible from this patch. Somewhere
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further in the code, the string that *i pointed to is freed again. That
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happens only when multiple services with the same name/path are specified.
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(cherry picked from commit dc7dd61de610e9330abe7014860acfa733887d5e)
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Resolves: #1409997
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---
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src/shared/install.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/src/shared/install.c b/src/shared/install.c
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index f01a21262..1b59a96b1 100644
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--- a/src/shared/install.c
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+++ b/src/shared/install.c
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@@ -1602,7 +1602,7 @@ int unit_file_unmask(
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_cleanup_set_free_free_ Set *remove_symlinks_to = NULL;
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_cleanup_free_ char *config_path = NULL;
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- _cleanup_free_ char **todo = NULL;
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+ _cleanup_strv_free_ char **todo = NULL;
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size_t n_todo = 0, n_allocated = 0;
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char **i;
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int r, q;
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@@ -1639,7 +1639,7 @@ int unit_file_unmask(
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if (!GREEDY_REALLOC0(todo, n_allocated, n_todo + 2))
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return -ENOMEM;
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- todo[n_todo++] = *i;
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+ todo[n_todo++] = strdup(*i);
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}
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strv_uniq(todo);
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