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authorEric Biggers <ebiggers@google.com>2017-06-02 20:35:51 -0700
committerJens Axboe <axboe@fb.com>2017-06-06 11:20:47 -0600
commit9bd2bbc01d17ddd567cc0f81f77fe1163e497462 (patch)
tree9bdbba0442abc5693474b607a9a79c2e826d636e /block/blk-throttle.c
parentd964f04a8fde84d978eff0d96561faa6e8de24de (diff)
downloadlinux-0-day-9bd2bbc01d17ddd567cc0f81f77fe1163e497462.tar.gz
elevator: fix truncation of icq_cache_name
gcc 7.1 reports the following warning: block/elevator.c: In function ‘elv_register’: block/elevator.c:898:5: warning: ‘snprintf’ output may be truncated before the last format character [-Wformat-truncation=] "%s_io_cq", e->elevator_name); ^~~~~~~~~~ block/elevator.c:897:3: note: ‘snprintf’ output between 7 and 22 bytes into a destination of size 21 snprintf(e->icq_cache_name, sizeof(e->icq_cache_name), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ "%s_io_cq", e->elevator_name); ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The bug is that the name of the icq_cache is 6 characters longer than the elevator name, but only ELV_NAME_MAX + 5 characters were reserved for it --- so in the case of a maximum-length elevator name, the 'q' character in "_io_cq" would be truncated by snprintf(). Fix it by reserving ELV_NAME_MAX + 6 characters instead. Signed-off-by: Eric Biggers <ebiggers@google.com> Reviewed-by: Bart Van Assche <Bart.VanAssche@sandisk.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/blk-throttle.c')
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