mirror of
https://github.com/torvalds/linux.git
synced 2026-07-28 01:55:51 +02:00
3a1230e7b0
In exfat_find_dir_entry(), each TYPE_EXTEND (file name) entry advances the output pointer by a fixed amount while the loop guard only tracks the accumulated name length: if (++order == 2) uniname = p_uniname->name; else uniname += EXFAT_FILE_NAME_LEN; len = exfat_extract_uni_name(ep, entry_uniname); name_len += len; unichar = *(uniname+len); *(uniname+len) = 0x0; uniname grows by EXFAT_FILE_NAME_LEN (15) per name entry, but name_len grows only by the actual extracted length, which is shorter when a name fragment contains an early NUL. The only guard is `name_len >= MAX_NAME_LENGTH`, so a crafted directory with many short name fragments lets uniname run far past the p_uniname->name[MAX_NAME_LENGTH + 3] buffer while name_len stays small, causing an out-of-bounds read and write at *(uniname+len). The sibling extractor exfat_get_uniname_from_ext_entry() already stops on a short fragment (the lockstep `len != EXFAT_FILE_NAME_LEN` guard added in commit |
||
|---|---|---|
| .. | ||
| balloc.c | ||
| cache.c | ||
| dir.c | ||
| exfat_fs.h | ||
| exfat_raw.h | ||
| fatent.c | ||
| file.c | ||
| inode.c | ||
| iomap.c | ||
| iomap.h | ||
| Kconfig | ||
| Makefile | ||
| misc.c | ||
| namei.c | ||
| nls.c | ||
| super.c | ||