diff options
Diffstat (limited to 'sys/contrib/dev/acpica/components/disassembler/dmbuffer.c')
| -rw-r--r-- | sys/contrib/dev/acpica/components/disassembler/dmbuffer.c | 27 |
1 files changed, 23 insertions, 4 deletions
diff --git a/sys/contrib/dev/acpica/components/disassembler/dmbuffer.c b/sys/contrib/dev/acpica/components/disassembler/dmbuffer.c index 8134848aa39a..365e3015744a 100644 --- a/sys/contrib/dev/acpica/components/disassembler/dmbuffer.c +++ b/sys/contrib/dev/acpica/components/disassembler/dmbuffer.c @@ -439,12 +439,16 @@ AcpiDmIsUnicodeBuffer ( return (FALSE); } - /* For each word, 1st byte must be ascii (1-0x7F), 2nd byte must be zero */ - + /* + * For each word, 1st byte must be printable ascii, and the + * 2nd byte must be zero. This does not allow for escape + * sequences, but it is the most secure way to detect a + * unicode string. + */ for (i = 0; i < (ByteCount - 2); i += 2) { if ((ByteData[i] == 0) || - (ByteData[i] > 0x7F) || + !(isprint (ByteData[i])) || (ByteData[(ACPI_SIZE) i + 1] != 0)) { return (FALSE); @@ -507,12 +511,27 @@ AcpiDmIsStringBuffer ( return (FALSE); } + /* + * Check for a possible standalone resource EndTag, ignore it + * here. However, this sequence is also the string "Y", but + * this seems rare enough to be acceptable. + */ + if ((ByteCount == 2) && (ByteData[0] == 0x79)) + { + return (FALSE); + } + + /* Check all bytes for ASCII */ + for (i = 0; i < (ByteCount - 1); i++) { - /* TBD: allow some escapes (non-ascii chars). + /* + * TBD: allow some escapes (non-ascii chars). * they will be handled in the string output routine */ + /* Not a string if not printable ascii */ + if (!isprint (ByteData[i])) { return (FALSE); |