diff options
| author | Tom Tromey <tom@tromey.com> | 2018-08-17 20:19:13 -0600 |
|---|---|---|
| committer | Tom Tromey <tom@tromey.com> | 2018-10-03 15:19:06 -0600 |
| commit | 4dd1b46077b2ae7331f274f7888733de5166445c (patch) | |
| tree | d23e75ce337d75dbd09e648aab85b5a68ac80244 /gdb/parse.c | |
| parent | 20562150d8a894bc91657c843ee88c508188e32e (diff) | |
| download | gdb-4dd1b46077b2ae7331f274f7888733de5166445c.zip gdb-4dd1b46077b2ae7331f274f7888733de5166445c.tar.gz gdb-4dd1b46077b2ae7331f274f7888733de5166445c.tar.bz2 | |
Avoid undefined behavior in read_signed_leb128
-fsanitize=undefined pointed out that read_signed_leb128 had an
undefined left-shift when processing the final byte of a 64-bit leb:
runtime error: left shift of 127 by 63 places cannot be represented in type 'long int'
and an undefined negation:
runtime error: negation of -9223372036854775808 cannot be represented in type 'long int'; cast to an unsigned type to negate this value to itself
Both of these problems are readily avoided by havinng
read_signed_leb128 work in an unsigned type, and then casting to the
signed type at the return.
gdb/ChangeLog
2018-10-03 Tom Tromey <tom@tromey.com>
* dwarf2read.c (read_signed_leb128): Work in ULONGEST.
Diffstat (limited to 'gdb/parse.c')
0 files changed, 0 insertions, 0 deletions