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| author | Eric Biggers <ebiggers@google.com> | 2017-06-02 20:35:51 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2017-06-06 11:20:47 -0600 |
| commit | 9bd2bbc01d17ddd567cc0f81f77fe1163e497462 (patch) | |
| tree | 9bdbba0442abc5693474b607a9a79c2e826d636e | |
| parent | d964f04a8fde84d978eff0d96561faa6e8de24de (diff) | |
| download | linux-9bd2bbc01d17ddd567cc0f81f77fe1163e497462.tar.bz2 | |
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>
| -rw-r--r-- | include/linux/elevator.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/elevator.h b/include/linux/elevator.h index 9ec5e22846e0..0e306c5a86d6 100644 --- a/include/linux/elevator.h +++ b/include/linux/elevator.h @@ -153,7 +153,7 @@ struct elevator_type #endif /* managed by elevator core */ - char icq_cache_name[ELV_NAME_MAX + 5]; /* elvname + "_io_cq" */ + char icq_cache_name[ELV_NAME_MAX + 6]; /* elvname + "_io_cq" */ struct list_head list; }; |