From: Matt Fleming <[email protected]> We're stuffing a variable of type size_t (unsigned) into a ssize_t (signed) which, even though both types should be the same number of bits, it's just asking for sign issues to be introduced.
Cc: Jeremy Kerr <[email protected]> Reported-by: Alan Cox <[email protected]> Signed-off-by: Matt Fleming <[email protected]> --- drivers/firmware/efivars.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c index 58cec62..9ac9340 100644 --- a/drivers/firmware/efivars.c +++ b/drivers/firmware/efivars.c @@ -694,6 +694,7 @@ static ssize_t efivarfs_file_write(struct file *file, struct inode *inode = file->f_mapping->host; unsigned long datasize = count - sizeof(attributes); unsigned long newdatasize; + ssize_t bytes = 0; if (count < sizeof(attributes)) return -EINVAL; @@ -706,22 +707,22 @@ static ssize_t efivarfs_file_write(struct file *file, efivars = var->efivars; if (copy_from_user(&attributes, userbuf, sizeof(attributes))) { - count = -EFAULT; + bytes = -EFAULT; goto out; } if (attributes & ~(EFI_VARIABLE_MASK)) { - count = -EINVAL; + bytes = -EINVAL; goto out; } if (copy_from_user(data, userbuf + sizeof(attributes), datasize)) { - count = -EFAULT; + bytes = -EFAULT; goto out; } if (validate_var(&var->var, data, datasize) == false) { - count = -EINVAL; + bytes = -EINVAL; goto out; } @@ -744,6 +745,8 @@ static ssize_t efivarfs_file_write(struct file *file, return efi_status_to_err(status); } + bytes = count; + /* * Writing to the variable may have caused a change in size (which * could either be an append or an overwrite), or the variable to be @@ -778,7 +781,7 @@ static ssize_t efivarfs_file_write(struct file *file, out: kfree(data); - return count; + return bytes; } static ssize_t efivarfs_file_read(struct file *file, char __user *userbuf, -- 1.7.11.7 -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
