From: Takashi Iwai Date: Tue, 29 Apr 2025 12:48:41 +0000 (+0200) Subject: ALSA: ump: Fix buffer overflow at UMP SysEx message conversion X-Git-Tag: v6.15-rc5~10^2~4 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=56f1f30e6795b890463d9b20b11e576adf5a2f77;p=thirdparty%2Flinux.git ALSA: ump: Fix buffer overflow at UMP SysEx message conversion The conversion function from MIDI 1.0 to UMP packet contains an internal buffer to keep the incoming MIDI bytes, and its size is 4, as it was supposed to be the max size for a MIDI1 UMP packet data. However, the implementation overlooked that SysEx is handled in a different format, and it can be up to 6 bytes, as found in do_convert_to_ump(). It leads eventually to a buffer overflow, and may corrupt the memory when a longer SysEx message is received. The fix is simply to extend the buffer size to 6 to fit with the SysEx UMP message. Fixes: 0b5288f5fe63 ("ALSA: ump: Add legacy raw MIDI support") Reported-by: Argusee Link: https://patch.msgid.link/20250429124845.25128-1-tiwai@suse.de Signed-off-by: Takashi Iwai --- diff --git a/include/sound/ump_convert.h b/include/sound/ump_convert.h index d099ae27f8491..682499b871eac 100644 --- a/include/sound/ump_convert.h +++ b/include/sound/ump_convert.h @@ -19,7 +19,7 @@ struct ump_cvt_to_ump_bank { /* context for converting from MIDI1 byte stream to UMP packet */ struct ump_cvt_to_ump { /* MIDI1 intermediate buffer */ - unsigned char buf[4]; + unsigned char buf[6]; /* up to 6 bytes for SysEx */ int len; int cmd_bytes;