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lib/iov_iter: fix import_iovec_ubuf iovec management

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commit f4b78260fc upstream.

import_iovec() says that it should always be fine to kfree the iovec
returned in @iovp regardless of the error code.  __import_iovec_ubuf()
never reallocates it and thus should clear the pointer even in cases when
copy_iovec_*() fail.

Link: https://lkml.kernel.org/r/378ae26923ffc20fd5e41b4360d673bf47b1775b.1738332461.git.asml.silence@gmail.com
Fixes: 3b2deb0e46 ("iov_iter: import single vector iovecs as ITER_UBUF")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christian Brauner <brauner@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pavel Begunkov 2025-01-31 14:13:15 +00:00 committed by Greg Kroah-Hartman
parent 4f31247ecb
commit 95b93d542c
1 changed files with 2 additions and 1 deletions
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3
lib/iov_iter.c
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@ -1441,6 +1441,8 @@ static ssize_t __import_iovec_ubuf(int type, const struct iovec __user *uvec,
struct iovec *iov = *iovp;
ssize_t ret;
*iovp = NULL;
if (compat)
ret = copy_compat_iovec_from_user(iov, uvec, 1);
else
@ -1451,7 +1453,6 @@ static ssize_t __import_iovec_ubuf(int type, const struct iovec __user *uvec,
ret = import_ubuf(type, iov->iov_base, iov->iov_len, i);
if (unlikely(ret))
return ret;
*iovp = NULL;
return i->count;
}