bcachefs: Fix shift by 64 in set_inc_field()

Browse source

UBSAN was complaining about a shift by 64 in set_inc_field().

This only happened when the value being shifted was 0, so in theory
should be harmless - a shift by 64 (or register width) should logically
give a result of 0, but CPUs will in practice leave the input unchanged
when the number of bits to shift by wraps - and since our input here is
0, the output is still what we want.

But, it's still undefined behaviour and we need our UBSAN output to be
clean, so it needs to be fixed.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

...

This commit is contained in:

Kent Overstreet 2023-08-03 16:38:36 -04:00

parent 6c6439650e

commit 77212d3a76

1 changed files with 24 additions and 27 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

51

fs/bcachefs/bkey.c

View file