67 lines
2.1 KiB
Diff
67 lines
2.1 KiB
Diff
From c3b1e4daa5b0ed5729f0f12bc6a3ba50a391f7f6 Mon Sep 17 00:00:00 2001
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From: hongjinghao <hongjinghao@huawei.com>
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Date: Thu, 4 Jan 2024 15:15:53 +0800
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Subject: [PATCH] Do not crash when reloading configuration with > 128 dirs
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When `dbus-daemon` sets more than 128 directories for `XDG_DATA_DIRS`,
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none of the elements in `new_dirs` will be `NULL`, which resulted in
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these loops reading out-of-bounds (undefined behaviour). In practice
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this led to a crash.
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To avoid this, make sure to stop iteration at the end of the array.
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[smcv: Expanded commit message]
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Resolves: dbus/dbus#481
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---
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bus/dir-watch-inotify.c | 4 ++--
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bus/dir-watch-kqueue.c | 4 ++--
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2 files changed, 4 insertions(+), 4 deletions(-)
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diff --git a/bus/dir-watch-inotify.c b/bus/dir-watch-inotify.c
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index 77b2d5a92..4f269777f 100644
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--- a/bus/dir-watch-inotify.c
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+++ b/bus/dir-watch-inotify.c
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@@ -131,7 +131,7 @@ _set_watched_dirs_internal (BusContext *context,
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/* Look for directories in both the old and new sets, if
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* we find one, move its data into the new set.
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*/
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- for (i = 0; new_dirs[i]; i++)
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+ for (i = 0; i < MAX_DIRS_TO_WATCH && new_dirs[i]; i++)
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{
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for (j = 0; j < num_wds; j++)
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{
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@@ -160,7 +160,7 @@ _set_watched_dirs_internal (BusContext *context,
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}
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}
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- for (i = 0; new_dirs[i]; i++)
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+ for (i = 0; i < MAX_DIRS_TO_WATCH && new_dirs[i]; i++)
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{
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if (new_wds[i] == -1)
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{
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diff --git a/bus/dir-watch-kqueue.c b/bus/dir-watch-kqueue.c
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index b419606e3..07b505c99 100644
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--- a/bus/dir-watch-kqueue.c
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+++ b/bus/dir-watch-kqueue.c
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@@ -235,7 +235,7 @@ bus_set_watched_dirs (BusContext *context, DBusList **directories)
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/* Look for directories in both the old and new sets, if
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* we find one, move its data into the new set.
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*/
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- for (i = 0; new_dirs[i]; i++)
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+ for (i = 0; i < MAX_DIRS_TO_WATCH && new_dirs[i]; i++)
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{
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for (j = 0; j < num_fds; j++)
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{
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@@ -264,7 +264,7 @@ bus_set_watched_dirs (BusContext *context, DBusList **directories)
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}
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}
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- for (i = 0; new_dirs[i]; i++)
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+ for (i = 0; i < MAX_DIRS_TO_WATCH && new_dirs[i]; i++)
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{
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if (new_fds[i] == -1)
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{
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--
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GitLab
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