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autofs-5.1.0 - fix buffer size checks in merge_options()
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From: Ian Kent <raven@themaw.net>
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Fix some buffer size overflow checks in merge_options().
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---
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CHANGELOG | 1 +
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lib/parse_subs.c | 25 +++++++++++++++++++++----
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2 files changed, 22 insertions(+), 4 deletions(-)
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--- autofs-5.0.7.orig/CHANGELOG
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+++ autofs-5.0.7/CHANGELOG
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@@ -137,6 +137,7 @@
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- fix signed comparison in inet_fill_net().
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- fix buffer size checks in get_network_proximity().
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- fix leak in get_network_proximity().
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+- fix buffer size checks in merge_options().
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25/07/2012 autofs-5.0.7
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=======================
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--- autofs-5.0.7.orig/lib/parse_subs.c
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+++ autofs-5.0.7/lib/parse_subs.c
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@@ -886,11 +886,11 @@ static char *hasopt(const char *str, con
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char *merge_options(const char *opt1, const char *opt2)
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{
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- char str[MAX_OPTIONS_LEN];
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- char result[MAX_OPTIONS_LEN];
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- char neg[MAX_OPTION_LEN];
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+ char str[MAX_OPTIONS_LEN + 1];
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+ char result[MAX_OPTIONS_LEN + 1];
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+ char neg[MAX_OPTION_LEN + 1];
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char *tok, *ptr = NULL;
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- size_t len;
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+ size_t resultlen, len;
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if ((!opt1 || !*opt1) && (!opt2 || !*opt2))
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return NULL;
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@@ -910,9 +910,12 @@ char *merge_options(const char *opt1, co
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if (!strcmp(opt1, opt2))
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return strdup(opt1);
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+ if (strlen(str) > MAX_OPTIONS_LEN)
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+ return NULL;
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memset(result, 0, sizeof(result));
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strcpy(str, opt1);
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+ resultlen = 0;
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tok = strtok_r(str, ",", &ptr);
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while (tok) {
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const char *this = (const char *) tok;
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@@ -920,12 +923,15 @@ char *merge_options(const char *opt1, co
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if (eq) {
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*eq = '\0';
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if (!hasopt(opt2, this)) {
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+ if (resultlen + strlen(this) > MAX_OPTIONS_LEN)
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+ return NULL;
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*eq = '=';
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if (!*result)
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strcpy(result, this);
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else
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strcat(result, this);
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strcat(result, ",");
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+ resultlen += strlen(this) + 1;
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goto next;
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}
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}
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@@ -946,10 +952,14 @@ char *merge_options(const char *opt1, co
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goto next;
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if (!strncmp(this, "no", 2)) {
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+ if (strlen(this + 2) > MAX_OPTION_LEN)
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+ return NULL;
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strcpy(neg, this + 2);
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if (hasopt(opt2, neg))
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goto next;
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} else {
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+ if ((strlen(this) + 2) > MAX_OPTION_LEN)
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+ return NULL;
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strcpy(neg, "no");
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strcat(neg, this);
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if (hasopt(opt2, neg))
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@@ -959,15 +969,22 @@ char *merge_options(const char *opt1, co
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if (hasopt(opt2, tok))
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goto next;
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+ if (resultlen + strlen(this) + 1 > MAX_OPTIONS_LEN)
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+ return NULL;
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+
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if (!*result)
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strcpy(result, this);
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else
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strcat(result, this);
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strcat(result, ",");
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+ resultlen =+ strlen(this) + 1;
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next:
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tok = strtok_r(NULL, ",", &ptr);
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}
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+ if (resultlen + strlen(opt2) > MAX_OPTIONS_LEN)
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+ return NULL;
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+
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if (!*result)
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strcpy(result, opt2);
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else
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