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authorThomas Maier <balagi@justmail.de>2006-10-22 19:17:47 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2006-12-01 14:52:01 -0800
commit035ed7a49447bc8e15d4d9316fc6a359b2d94333 (patch)
tree2607c8c03a719e4aa4bbbe46ca4ee3eb490755b5
parent06a4bcae1ff2cd5f6f42bd74add85ec785a26343 (diff)
sysfs: sysfs_write_file() writes zero terminated data
since most of the files in sysfs are text files, it would be nice, if the "store" function called during sysfs_write_file() gets a zero terminated string / data. The current implementation seems not to ensure this. (But only if it is the first time the zeroed buffer page is allocated.) So the buffer can be scanned by sscanf() easily, for example. This patch simply sets a \0 char behind the data in buffer->page. Signed-off-by: Thomas Maier <balagi@justmail.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--fs/sysfs/file.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index 298303b5a716..95c165101c98 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -190,6 +190,9 @@ fill_write_buffer(struct sysfs_buffer * buffer, const char __user * buf, size_t
count = PAGE_SIZE - 1;
error = copy_from_user(buffer->page,buf,count);
buffer->needs_read_fill = 1;
+ /* if buf is assumed to contain a string, terminate it by \0,
+ so e.g. sscanf() can scan the string easily */
+ buffer->page[count] = 0;
return error ? -EFAULT : count;
}