From d59c4063f393774c2c4328061b1e47c7dbb0250c Mon Sep 17 00:00:00 2001 From: Nick Mathewson Date: Wed, 15 Apr 2015 10:47:50 -0400 Subject: [PATCH] Stop modifying const argument in handle_control_postdescriptor Fixes 15546. --- changes/bug15546 | 4 ++++ src/or/control.c | 9 ++++++--- 2 files changed, 10 insertions(+), 3 deletions(-) create mode 100644 changes/bug15546 diff --git a/changes/bug15546 b/changes/bug15546 new file mode 100644 index 0000000000..b33b0aa511 --- /dev/null +++ b/changes/bug15546 @@ -0,0 +1,4 @@ + o Minor bugfixes: + - For correctness, avoid modifying a constant string in + handle_control_postdescriptor. Fixes bug 15546; bugfix on + 0.1.1.16-rc. \ No newline at end of file diff --git a/src/or/control.c b/src/or/control.c index 5ec97bd9af..9b0981d84a 100644 --- a/src/or/control.c +++ b/src/or/control.c @@ -2733,12 +2733,14 @@ handle_control_postdescriptor(control_connection_t *conn, uint32_t len, uint8_t purpose = ROUTER_PURPOSE_GENERAL; int cache = 0; /* eventually, we may switch this to 1 */ - char *cp = memchr(body, '\n', len); + const char *cp = memchr(body, '\n', len); smartlist_t *args = smartlist_new(); tor_assert(cp); - *cp++ = '\0'; + ++cp; - smartlist_split_string(args, body, " ", + char *cmdline = tor_memdup_nulterm(body, cp-body); + + smartlist_split_string(args, cmdline, " ", SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0); SMARTLIST_FOREACH_BEGIN(args, char *, option) { if (!strcasecmpstart(option, "purpose=")) { @@ -2787,6 +2789,7 @@ handle_control_postdescriptor(control_connection_t *conn, uint32_t len, done: SMARTLIST_FOREACH(args, char *, arg, tor_free(arg)); smartlist_free(args); + tor_free(cmdline); return 0; }