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Fix fuzzing timeout in the new IFW CPD parsing

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Limit the number of images to an order of magnitide more than we've ever seen.

Fixes https://oss-fuzz.com/testcase-detail/4842982326534144
This commit is contained in:
Richard Hughes 2022-07-08 15:17:25 +01:00
parent 7a224007f2
commit cb0966858d
1 changed files with 10 additions and 0 deletions
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10
libfwupdplugin/fu-ifwi-cpd-firmware.c
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@ -38,6 +38,7 @@ G_DEFINE_TYPE_WITH_PRIVATE(FuIfwiCpdFirmware, fu_ifwi_cpd_firmware, FU_TYPE_FIRM
#define GET_PRIVATE(o) (fu_ifwi_cpd_firmware_get_instance_private(o))
#define FU_IFWI_CPD_FIRMWARE_HEADER_MARKER 0x44504324
#define FU_IFWI_CPD_FIRMWARE_ENTRIES_MAX 1024
typedef struct __attribute__((packed)) {
guint32 header_marker;
@ -258,6 +259,15 @@ fu_ifwi_cpd_firmware_parse(FuFirmware *firmware,
G_LITTLE_ENDIAN,
error))
return FALSE;
if (num_of_entries > FU_IFWI_CPD_FIRMWARE_ENTRIES_MAX) {
g_set_error(error,
G_IO_ERROR,
G_IO_ERROR_INVALID_DATA,
"too many entries 0x%x, expected <= 0x%x",
num_of_entries,
(guint)FU_IFWI_CPD_FIRMWARE_ENTRIES_MAX);
return FALSE;
}
offset += header_length;
for (guint32 i = 0; i < num_of_entries; i++) {
gchar name[12] = {0x0};