From f36f21ecca9ee688301174e5f2e0827827a7a7ff Mon Sep 17 00:00:00 2001 From: Jean Delvare Date: Mon, 12 May 2008 14:02:33 -0700 Subject: [PATCH] Fix misuses of bdevname() bdevname() fills the buffer that it is given as a parameter, so calling strcpy() or snprintf() on the returned value is redundant (and probably not guaranteed to work - I don't think strcpy and snprintf support overlapping buffers.) Signed-off-by: Jean Delvare Cc: Stephen Tweedie Cc: Jens Axboe Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- block/blktrace.c | 2 +- block/compat_ioctl.c | 2 +- fs/ext4/mballoc.c | 6 ++---- fs/jbd2/journal.c | 4 ++-- 4 files changed, 6 insertions(+), 8 deletions(-) diff --git a/block/blktrace.c b/block/blktrace.c index 568588cd16..b2cbb4e5d7 100644 --- a/block/blktrace.c +++ b/block/blktrace.c @@ -476,7 +476,7 @@ int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg) switch (cmd) { case BLKTRACESETUP: - strcpy(b, bdevname(bdev, b)); + bdevname(bdev, b); ret = blk_trace_setup(q, b, bdev->bd_dev, arg); break; case BLKTRACESTART: diff --git a/block/compat_ioctl.c b/block/compat_ioctl.c index c70d0b6f66..c23177e462 100644 --- a/block/compat_ioctl.c +++ b/block/compat_ioctl.c @@ -555,7 +555,7 @@ static int compat_blk_trace_setup(struct block_device *bdev, char __user *arg) if (copy_from_user(&cbuts, arg, sizeof(cbuts))) return -EFAULT; - strcpy(b, bdevname(bdev, b)); + bdevname(bdev, b); buts = (struct blk_user_trace_setup) { .act_mask = cbuts.act_mask, diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index fbec2ef937..b128bdc0f5 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -2639,8 +2639,7 @@ static int ext4_mb_init_per_dev_proc(struct super_block *sb) struct proc_dir_entry *proc; char devname[64]; - snprintf(devname, sizeof(devname) - 1, "%s", - bdevname(sb->s_bdev, devname)); + bdevname(sb->s_bdev, devname); sbi->s_mb_proc = proc_mkdir(devname, proc_root_ext4); MB_PROC_HANDLER(EXT4_MB_STATS_NAME, stats); @@ -2674,8 +2673,7 @@ static int ext4_mb_destroy_per_dev_proc(struct super_block *sb) if (sbi->s_mb_proc == NULL) return -EINVAL; - snprintf(devname, sizeof(devname) - 1, "%s", - bdevname(sb->s_bdev, devname)); + bdevname(sb->s_bdev, devname); remove_proc_entry(EXT4_MB_GROUP_PREALLOC, sbi->s_mb_proc); remove_proc_entry(EXT4_MB_STREAM_REQ, sbi->s_mb_proc); remove_proc_entry(EXT4_MB_ORDER2_REQ, sbi->s_mb_proc); diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c index 53632e3e84..2e24567c4a 100644 --- a/fs/jbd2/journal.c +++ b/fs/jbd2/journal.c @@ -901,7 +901,7 @@ static void jbd2_stats_proc_init(journal_t *journal) { char name[BDEVNAME_SIZE]; - snprintf(name, sizeof(name) - 1, "%s", bdevname(journal->j_dev, name)); + bdevname(journal->j_dev, name); journal->j_proc_entry = proc_mkdir(name, proc_jbd2_stats); if (journal->j_proc_entry) { proc_create_data("history", S_IRUGO, journal->j_proc_entry, @@ -915,7 +915,7 @@ static void jbd2_stats_proc_exit(journal_t *journal) { char name[BDEVNAME_SIZE]; - snprintf(name, sizeof(name) - 1, "%s", bdevname(journal->j_dev, name)); + bdevname(journal->j_dev, name); remove_proc_entry("info", journal->j_proc_entry); remove_proc_entry("history", journal->j_proc_entry); remove_proc_entry(name, proc_jbd2_stats); -- 2.39.5