diff mbox series

[BlueZ,02/14] attrib/gatt: Guard against possible integer overflow

Message ID 20240510091814.3172988-3-hadess@hadess.net (mailing list archive)
State Superseded
Headers show
Series Fix a number of static analysis issues | expand

Checks

Context Check Description
tedd_an/pre-ci_am success Success
tedd_an/CheckPatch success CheckPatch PASS
tedd_an/GitLint fail WARNING: I3 - ignore-body-lines: gitlint will be switching from using Python regex 'match' (match beginning) to 'search' (match anywhere) semantics. Please review your ignore-body-lines.regex option accordingly. To remove this warning, set general.regex-style-search=True. More details: https://jorisroovers.github.io/gitlint/configuration/#regex-style-search 4: B1 Line exceeds max length (94>80): "bluez-5.75/attrib/gatt.c:1016:2: known_value_assign: "last" = "65535", its value is now 65535." 5: B1 Line exceeds max length (216>80): "bluez-5.75/attrib/gatt.c:1087:2: overflow_const: Expression "dd->start", which is equal to 65536, where "last + 1" is known to be equal to 65536, overflows the type that receives it, an unsigned integer 16 bits wide." 6: B3 Line contains hard tab characters (\t): "1085| }" 8: B3 Line contains hard tab characters (\t): "1087|-> dd->start = last + 1;" 10: B3 Line contains hard tab characters (\t): "1089| if (last < dd->end && !uuid_found) {"
tedd_an/IncrementalBuild success Incremental Build PASS

Commit Message

Bastien Nocera May 10, 2024, 9:11 a.m. UTC
Error: INTEGER_OVERFLOW (CWE-190): [#def30]
bluez-5.75/attrib/gatt.c:1016:2: known_value_assign: "last" = "65535", its value is now 65535.
bluez-5.75/attrib/gatt.c:1087:2: overflow_const: Expression "dd->start", which is equal to 65536, where "last + 1" is known to be equal to 65536, overflows the type that receives it, an unsigned integer 16 bits wide.
1085|		}
1086|
1087|->		dd->start = last + 1;
1088|
1089|		if (last < dd->end && !uuid_found) {
---
 attrib/gatt.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/attrib/gatt.c b/attrib/gatt.c
index b496dd1ebd95..3cedae9d167a 100644
--- a/attrib/gatt.c
+++ b/attrib/gatt.c
@@ -1076,10 +1076,12 @@  static void desc_discovered_cb(guint8 status, const guint8 *ipdu,
 	att_data_list_free(list);
 
 	/*
-	 * If last handle is lower from previous start handle then it is smth
-	 * wrong. Let's stop search, otherwise we might enter infinite loop.
+	 * If last handle is lower from previous start handle or if iterating
+	 * to the next handle from the last possible offset would overflow, then
+	 * something is wrong. Let's stop search, otherwise we might enter
+	 * infinite loop.
 	 */
-	if (last < dd->start) {
+	if (last < dd->start || last == G_MAXUINT16) {
 		err = ATT_ECODE_UNLIKELY;
 		goto done;
 	}