If user specifies too low end sector for trimming, f2fs_trim_fs() will use uninitialized value as a number of trimmed blocks and returns it to userspace. Initialize number of trimmed blocks early to avoid the problem. Coverity-id: 1248809 CC: stable@xxxxxxxxxxxxxxx Signed-off-by: Jan Kara <jack@xxxxxxx> --- fs/f2fs/segment.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index 923cb76fdc46..3c31221affe6 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -1004,6 +1004,7 @@ int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct fstrim_range *range) range->len < sbi->blocksize) return -EINVAL; + cpc.trimmed = 0; if (end <= MAIN_BLKADDR(sbi)) goto out; @@ -1015,7 +1016,6 @@ int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct fstrim_range *range) cpc.trim_start = start_segno; cpc.trim_end = end_segno; cpc.trim_minlen = range->minlen >> sbi->log_blocksize; - cpc.trimmed = 0; /* do checkpoint to issue discard commands safely */ write_checkpoint(sbi, &cpc); -- 1.8.1.4 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html