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From c2b36aa61e333e2492ced8beaa84f6f19b8cf6ed Mon Sep 17 00:00:00 2001
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From: Sebastien GODARD <sysstat@users.noreply.github.com>
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Date: Sat, 30 Dec 2017 11:16:32 +0100
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Subject: [PATCH] sadc: Fix segfault that may happen when appending data to
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file
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Buffers need to be allocated according to activities present in file so
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that we can append data to that file.
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Signed-off-by: Sebastien GODARD <sysstat@users.noreply.github.com>
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(cherry-picked from commit 1cf6596368da94ac48656dbb117f4e8c0cde58b9)
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---
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sadc.c | 29 +++++++++++++++--------------
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1 file changed, 15 insertions(+), 14 deletions(-)
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diff --git a/sadc.c b/sadc.c
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index 53e9175..fa94d1f 100644
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--- a/sadc.c
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+++ b/sadc.c
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@@ -824,20 +824,21 @@ void open_ofile(int *ofd, char ofile[])
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for (i = 0; i < file_hdr.sa_nr_act; i++) {
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p = get_activity_position(act, file_act[i].id);
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-
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- if ((act[p]->nr != file_act[i].nr) || (act[p]->nr2 != file_act[i].nr2)) {
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- /*
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- * Force number of items (serial lines, network interfaces...)
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- * and sub-items to that of the file, and reallocate structures.
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- */
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- act[p]->nr = file_act[i].nr;
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- act[p]->nr2 = file_act[i].nr2;
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- SREALLOC(act[p]->_buf0, void, act[p]->msize * act[p]->nr * act[p]->nr2);
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- }
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-
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- /* Save activity sequence */
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- id_seq[i] = file_act[i].id;
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- act[p]->options |= AO_COLLECTED;
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+
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+ act[p]->nr = file_act[i].nr;
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+ /*
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+ * Force number of sub-items to that of the file, and reallocate structures.
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+ * Note: Structures have been allocated in sa_sys_init() only for activities
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+ * that are collected. But since activities from file now prevail over them,
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+ * we need to reallocate.
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+ */
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+ act[p]->nr2 = file_act[i].nr2;
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+ SREALLOC(act[p]->_buf0, void,
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+ (size_t) act[p]->msize * (size_t) act[p]->nr * (size_t) act[p]->nr2);
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+
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+ /* Save activity sequence */
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+ id_seq[i] = file_act[i].id;
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+ act[p]->options |= AO_COLLECTED;
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}
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}
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}
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--
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2.21.0
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