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app_voicemail: Fix unchecked bounds of myArray in IMAP_STORAGE.

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In update_messages_by_imapuser(), messages were appended to a finite
array which resulted in a crash when an IMAP mailbox contained more
than 256 entries. This memory is now dynamically increased as needed.

Observe that this patch adds a bunch of XXX's to questionable code. See
the review (url below) for more information.

ASTERISK-24190 #close
Reported by: Nick Adams
Tested by: Nick Adams

Review: https://reviewboard.asterisk.org/r/4126/
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Merged revisions 426691 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 426692 from http://svn.asterisk.org/svn/asterisk/branches/11
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Merged revisions 426696 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/13@426702 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Walter Doekes
2014-10-30 09:20:28 +00:00
parent 934ab9d1b8
commit 3f31b73f54
1 changed files with 28 additions and 7 deletions
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35
apps/app_voicemail.c
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@@ -861,7 +861,8 @@ struct vm_state {
#ifdef IMAP_STORAGE
ast_mutex_t lock;
int updated; /*!< decremented on each mail check until 1 -allows delay */
long msgArray[VMSTATE_MAX_MSG_ARRAY];
long *msgArray;
unsigned msg_array_max;
MAILSTREAM *mailstream;
int vmArrayIndex;
char imapuser[80]; /*!< IMAP server login */
@@ -2440,6 +2441,7 @@ static int __messagecount(const char *context, const char *mailbox, const char *
free_user(vmu);
return -1;
}
ast_assert(msgnum < vms->msg_array_max);
/* check if someone is accessing this box right now... */
vms_p = get_vm_state_by_imapuser(vmu->imapuser, 1);
@@ -3081,6 +3083,17 @@ static void update_messages_by_imapuser(const char *user, unsigned long number)
}
ast_debug(3, "saving mailbox message number %lu as message %d. Interactive set to %d\n", number, vms->vmArrayIndex, vms->interactive);
/* Ensure we have room for the next message. */
if (vms->vmArrayIndex >= vms->msg_array_max) {
long *new_mem = ast_realloc(vms->msgArray, 2 * vms->msg_array_max * sizeof(long));
if (!new_mem) {
return;
}
vms->msgArray = new_mem;
vms->msg_array_max *= 2;
}
vms->msgArray[vms->vmArrayIndex++] = number;
}
@@ -3358,6 +3371,7 @@ static struct vm_state *create_vm_state_from_user(struct ast_vm_user *vmu)
return vms_p;
}
ast_debug(5, "Adding new vmstate for %s\n", vmu->imapuser);
/* XXX: Is this correctly freed always? */
if (!(vms_p = ast_calloc(1, sizeof(*vms_p))))
return NULL;
ast_copy_string(vms_p->imapuser, vmu->imapuser, sizeof(vms_p->imapuser));
@@ -3472,6 +3486,7 @@ static void vmstate_insert(struct vm_state *vms)
vms->newmessages = altvms->newmessages;
vms->oldmessages = altvms->oldmessages;
vms->vmArrayIndex = altvms->vmArrayIndex;
/* XXX: no msgArray copying? */
vms->lastmsg = altvms->lastmsg;
vms->curmsg = altvms->curmsg;
/* get a pointer to the persistent store */
@@ -3530,10 +3545,14 @@ static void vmstate_delete(struct vm_state *vms)
if (vc) {
ast_mutex_destroy(&vc->vms->lock);
ast_free(vc->vms->msgArray);
vc->vms->msgArray = NULL;
vc->vms->msg_array_max = 0;
/* XXX: is no one supposed to free vms itself? */
ast_free(vc);
}
else
} else {
ast_log(AST_LOG_ERROR, "No vmstate found for user:%s, mailbox %s\n", vms->imapuser, vms->username);
}
}
static void set_update(MAILSTREAM * stream)
@@ -3555,11 +3574,13 @@ static void set_update(MAILSTREAM * stream)
static void init_vm_state(struct vm_state *vms)
{
int x;
vms->vmArrayIndex = 0;
for (x = 0; x < VMSTATE_MAX_MSG_ARRAY; x++) {
vms->msgArray[x] = 0;
vms->msg_array_max = VMSTATE_MAX_MSG_ARRAY;
vms->msgArray = ast_calloc(vms->msg_array_max, sizeof(long));
if (!vms->msgArray) {
/* Out of mem? This can't be good. */
vms->msg_array_max = 0;
}
vms->vmArrayIndex = 0;
ast_mutex_init(&vms->lock);
}