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From 69bc94779c2f035a9fffdb5327a54c3aeca73ed5 Mon Sep 17 00:00:00 2001
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From: Simon Kelley <simon@thekelleys.org.uk>
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Date: Wed, 14 Aug 2019 20:44:50 +0100
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Subject: [PATCH] Fix memory leak in helper.c
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Thanks to Xu Mingjie <xumingjie1995@outlook.com> for spotting this.
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---
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src/helper.c | 12 +++++++++---
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1 file changed, 9 insertions(+), 3 deletions(-)
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diff --git a/src/helper.c b/src/helper.c
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index 33ba120..c392eec 100644
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--- a/src/helper.c
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+++ b/src/helper.c
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@@ -80,7 +80,8 @@ int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd)
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pid_t pid;
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int i, pipefd[2];
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struct sigaction sigact;
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-
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+ unsigned char *alloc_buff = NULL;
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+
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/* create the pipe through which the main program sends us commands,
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then fork our process. */
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if (pipe(pipefd) == -1 || !fix_fd(pipefd[1]) || (pid = fork()) == -1)
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@@ -186,11 +187,16 @@ int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd)
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struct script_data data;
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char *p, *action_str, *hostname = NULL, *domain = NULL;
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unsigned char *buf = (unsigned char *)daemon->namebuff;
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- unsigned char *end, *extradata, *alloc_buff = NULL;
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+ unsigned char *end, *extradata;
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int is6, err = 0;
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int pipeout[2];
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- free(alloc_buff);
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+ /* Free rarely-allocated memory from previous iteration. */
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+ if (alloc_buff)
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+ {
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+ free(alloc_buff);
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+ alloc_buff = NULL;
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+ }
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/* we read zero bytes when pipe closed: this is our signal to exit */
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if (!read_write(pipefd[0], (unsigned char *)&data, sizeof(data), 1))
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--
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2.21.1
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