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From d414a9c447c79b0e39587998f71f8576605b4fb4 Mon Sep 17 00:00:00 2001
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From: Chris Dickens <christopher.a.dickens@gmail.com>
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Date: Mon, 13 Jan 2020 15:05:00 -0800
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Subject: [PATCH 09/10] core: Do not attempt to destroy a default context that
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doesn't exist
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Calling libusb_exit(NULL) when a successful call to libusb_init(NULL)
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has not been made results in a segmentation violation. This is
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definitely a user error, but we can easily guard against it.
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Closes #511
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Signed-off-by: Chris Dickens <christopher.a.dickens@gmail.com>
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(cherry picked from commit a5624b22267ec0e146825d3fe94d9e4b2f5ae503)
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---
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libusb/core.c | 16 +++++++++++-----
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libusb/version_nano.h | 2 +-
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2 files changed, 12 insertions(+), 6 deletions(-)
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diff --git a/libusb/core.c b/libusb/core.c
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index 5c0a2e0..26df871 100644
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--- a/libusb/core.c
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+++ b/libusb/core.c
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@@ -2305,7 +2305,7 @@ int API_EXPORTED libusb_init(libusb_context **context)
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usbi_mutex_static_lock(&active_contexts_lock);
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if (first_init) {
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first_init = 0;
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- list_init (&active_contexts_list);
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+ list_init(&active_contexts_list);
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}
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list_add (&ctx->list, &active_contexts_list);
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usbi_mutex_static_unlock(&active_contexts_lock);
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@@ -2337,7 +2337,7 @@ err_free_ctx:
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}
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usbi_mutex_static_lock(&active_contexts_lock);
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- list_del (&ctx->list);
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+ list_del(&ctx->list);
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usbi_mutex_static_unlock(&active_contexts_lock);
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usbi_mutex_lock(&ctx->usb_devs_lock);
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@@ -2375,6 +2375,12 @@ void API_EXPORTED libusb_exit(struct libusb_context *ctx)
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* if we're the last user */
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usbi_mutex_static_lock(&default_context_lock);
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if (ctx == usbi_default_context) {
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+ if (!usbi_default_context) {
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+ usbi_dbg("no default context, not initialized?");
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+ usbi_mutex_static_unlock(&default_context_lock);
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+ return;
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+ }
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+
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if (--default_context_refcnt > 0) {
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usbi_dbg("not destroying default context");
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usbi_mutex_static_unlock(&default_context_lock);
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@@ -2390,12 +2396,12 @@ void API_EXPORTED libusb_exit(struct libusb_context *ctx)
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*/
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destroying_default_context = 1;
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} else {
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- // Unlock default context, as we're not modifying it.
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+ /* Unlock default context, as we're not modifying it. */
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usbi_mutex_static_unlock(&default_context_lock);
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- }
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+ }
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usbi_mutex_static_lock(&active_contexts_lock);
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- list_del (&ctx->list);
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+ list_del(&ctx->list);
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usbi_mutex_static_unlock(&active_contexts_lock);
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if (libusb_has_capability(LIBUSB_CAP_HAS_HOTPLUG)) {
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diff --git a/libusb/version_nano.h b/libusb/version_nano.h
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index 57c2b1d..3247cec 100644
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--- a/libusb/version_nano.h
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+++ b/libusb/version_nano.h
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@@ -1 +1 @@
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-#define LIBUSB_NANO 11426
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+#define LIBUSB_NANO 11427
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--
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2.26.1
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