Messages in this thread | | | Date | Mon, 11 Apr 2011 16:28:16 -0700 | From | Tim Gardner <> | Subject | Re: [PATCH]initialize the array of fs/ncpfs/inode.c |
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On 04/11/2011 04:18 PM, Andrew Morton wrote: > On Sun, 10 Apr 2011 18:08:18 +0800 > Harry Wei<jiaweiwei.xiyou@gmail.com> wrote: > >> Hi us, >> When i compile the linux-2.6.38.2, some warnings happened >> to me. One of them is like following. >> >> fs/ncpfs/inode.c: In function 'ncp_fill_super': >> fs/ncpfs/inode.c:451: warning: 'data.mounted_vol[1u]' may be used >> uninitialized in this function >> ... >> See details by the URL: >> http://s1202.photobucket.com/albums/bb364/harrywei/Kernel/?action=view¤t=patched.png > > Yup. The compiler is "wrong" because it doesn't know that the > uninitialised bytes will never be read, because they fall after the > '\0' in a null-terminated string. > >> @@ -461,6 +462,7 @@ static int ncp_fill_super(struct super_block *sb, void *raw_data, int silent) >> #endif >> struct ncp_entry_info finfo; >> >> + data.mounted_vol[NCP_VOLNAME_LEN + 1] = {0}; >> data.wdog_pid = NULL; >> server = kzalloc(sizeof(struct ncp_server), GFP_KERNEL); >> if (!server) > > hm. I'm not sure that this fixed data.mounted_vol[2u], > data.mounted_vol[3u], etc. > > How about we use the big hammer? > > > > From: Andrew Morton<akpm@linux-foundation.org> > > fs/ncpfs/inode.c: In function 'ncp_fill_super': > fs/ncpfs/inode.c:451: warning: 'data.mounted_vol[1u]' may be used uninitialized in this function > fs/ncpfs/inode.c:451: warning: 'data.mounted_vol[2u]' may be used uninitialized in this function > fs/ncpfs/inode.c:451: warning: 'data.mounted_vol[3u]' may be used uninitialized in this function > ... > > It's notabug, but we can easily fix it with a memset(). > > Reported-by: Harry Wei<jiaweiwei.xiyou@gmail.com> > Cc: Petr Vandrovec<petr@vandrovec.name> > Signed-off-by: Andrew Morton<akpm@linux-foundation.org> > --- > > fs/ncpfs/inode.c | 4 +--- > 1 file changed, 1 insertion(+), 3 deletions(-) > > diff -puN fs/ncpfs/inode.c~fs-ncpfs-inodec-suppress-used-uninitialised-warning fs/ncpfs/inode.c > --- a/fs/ncpfs/inode.c~fs-ncpfs-inodec-suppress-used-uninitialised-warning > +++ a/fs/ncpfs/inode.c > @@ -461,7 +461,7 @@ static int ncp_fill_super(struct super_b > #endif > struct ncp_entry_info finfo; > > - data.wdog_pid = NULL; > + memset(data, 0, sizeof(data));
Needs '&' ?
memset(&data, 0, sizeof(data));
> server = kzalloc(sizeof(struct ncp_server), GFP_KERNEL); > if (!server) > return -ENOMEM; > @@ -496,7 +496,6 @@ static int ncp_fill_super(struct super_b > struct ncp_mount_data_v4* md = (struct ncp_mount_data_v4*)raw_data; > > data.flags = md->flags; > - data.int_flags = 0; > data.mounted_uid = md->mounted_uid; > data.wdog_pid = find_get_pid(md->wdog_pid); > data.ncp_fd = md->ncp_fd; > @@ -507,7 +506,6 @@ static int ncp_fill_super(struct super_b > data.file_mode = md->file_mode; > data.dir_mode = md->dir_mode; > data.info_fd = -1; > - data.mounted_vol[0] = 0; > } > break; > default: > _ > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/
-- Tim Gardner tim.gardner@canonical.com
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