linux-ext4 - Re: [PATCH 28/74] libext2fs: check return values

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Date:	Tue, 17 Dec 2013 10:57:07 -0600
From:	Eric Sandeen <sandeen@...hat.com>
To:	"Darrick J. Wong" <darrick.wong@...cle.com>, tytso@....edu
CC:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 28/74] libext2fs: check return values

On 12/10/13, 7:21 PM, Darrick J. Wong wrote:
> Fix up a few places where we ignore return values.
> 
> Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
> ---
>  lib/ext2fs/flushb.c    |    2 +-
>  lib/ext2fs/icount.c    |    2 ++
>  lib/ext2fs/imager.c    |    7 ++++++-
>  lib/ext2fs/mkjournal.c |    4 +++-
>  lib/ext2fs/punch.c     |    7 +++++++
>  5 files changed, 19 insertions(+), 3 deletions(-)
> 
> 
> diff --git a/lib/ext2fs/flushb.c b/lib/ext2fs/flushb.c
> index ac8923c..98821fc 100644
> --- a/lib/ext2fs/flushb.c
> +++ b/lib/ext2fs/flushb.c
> @@ -70,7 +70,7 @@ errcode_t ext2fs_sync_device(int fd, int flushb)
>  #warning BLKFLSBUF not defined
>  #endif
>  #ifdef FDFLUSH
> -		ioctl (fd, FDFLUSH, 0);   /* In case this is a floppy */
> +		return ioctl(fd, FDFLUSH, 0);   /* In case this is a floppy */
>  #elif defined(__linux__)
>  #warning FDFLUSH not defined
>  #endif
> diff --git a/lib/ext2fs/icount.c b/lib/ext2fs/icount.c
> index 84b74a9..c5ebf74 100644
> --- a/lib/ext2fs/icount.c
> +++ b/lib/ext2fs/icount.c
> @@ -193,6 +193,8 @@ errcode_t ext2fs_create_icount_tdb(ext2_filsys fs, char *tdb_dir,
>  	uuid_unparse(fs->super->s_uuid, uuid);
>  	sprintf(fn, "%s/%s-icount-XXXXXX", tdb_dir, uuid);
>  	fd = mkstemp(fn);
> +	if (fd < 0)
> +		return fd;

Turns out this leaks "fn" (coverity spotted this, CID 1138575)

Thanks,
-Eric

>  
>  	/*
>  	 * This is an overestimate of the size that we will need; the
> diff --git a/lib/ext2fs/imager.c b/lib/ext2fs/imager.c
> index 7f3b25b..378a3c8 100644
> --- a/lib/ext2fs/imager.c
> +++ b/lib/ext2fs/imager.c
> @@ -66,6 +66,7 @@ errcode_t ext2fs_image_inode_write(ext2_filsys fs, int fd, int flags)
>  	blk64_t		blk;
>  	ssize_t		actual;
>  	errcode_t	retval;
> +	off_t		r;
>  
>  	buf = malloc(fs->blocksize * BUF_BLOCKS);
>  	if (!buf)
> @@ -97,7 +98,11 @@ errcode_t ext2fs_image_inode_write(ext2_filsys fs, int fd, int flags)
>  					blk++;
>  					left--;
>  					cp += fs->blocksize;
> -					lseek(fd, fs->blocksize, SEEK_CUR);
> +					r = lseek(fd, fs->blocksize, SEEK_CUR);
> +					if (r < 0) {
> +						retval = errno;
> +						goto errout;
> +					}
>  					continue;
>  				}
>  				/* Find non-zero blocks */
> diff --git a/lib/ext2fs/mkjournal.c b/lib/ext2fs/mkjournal.c
> index 2afd3b7..1d5b1a7 100644
> --- a/lib/ext2fs/mkjournal.c
> +++ b/lib/ext2fs/mkjournal.c
> @@ -520,8 +520,10 @@ errcode_t ext2fs_add_journal_inode(ext2_filsys fs, blk_t num_blocks, int flags)
>  #if HAVE_EXT2_IOCTLS
>  		fd = open(jfile, O_RDONLY);
>  		if (fd >= 0) {
> -			ioctl(fd, EXT2_IOC_SETFLAGS, &f);
> +			retval = ioctl(fd, EXT2_IOC_SETFLAGS, &f);
>  			close(fd);
> +			if (retval)
> +				return retval;
>  		}
>  #endif
>  #endif
> diff --git a/lib/ext2fs/punch.c b/lib/ext2fs/punch.c
> index 790a0ad8..ceec336 100644
> --- a/lib/ext2fs/punch.c
> +++ b/lib/ext2fs/punch.c
> @@ -192,6 +192,13 @@ static errcode_t ext2fs_punch_extent(ext2_filsys fs, ext2_ino_t ino,
>  	retval = ext2fs_extent_open2(fs, ino, inode, &handle);
>  	if (retval)
>  		return retval;
> +	/*
> +	 * Find the extent closest to the start of the punch range.  We don't
> +	 * check the return value because _goto() sets the current node to the
> +	 * next-lowest extent if 'start' is in a hole, and doesn't set a
> +	 * current node if there was a real error reading the extent tree.
> +	 * In that case, _get() will error out.
> +	 */
>  	ext2fs_extent_goto(handle, start);
>  	retval = ext2fs_extent_get(handle, EXT2_EXTENT_CURRENT, &extent);
>  	if (retval)
> 
> --
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