From f4b78260fc678ccd7169f32dc9f3bfa3b93931c7 Mon Sep 17 00:00:00 2001 From: Pavel Begunkov Date: Fri, 31 Jan 2025 14:13:15 +0000 Subject: [PATCH] lib/iov_iter: fix import_iovec_ubuf iovec management 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: 3b2deb0e46da ("iov_iter: import single vector iovecs as ITER_UBUF") Signed-off-by: Pavel Begunkov Reviewed-by: Jens Axboe Cc: Al Viro Cc: Christian Brauner Cc: Signed-off-by: Andrew Morton --- lib/iov_iter.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/lib/iov_iter.c b/lib/iov_iter.c index 9ec806f989f2..65f550cb5081 100644 --- a/lib/iov_iter.c +++ b/lib/iov_iter.c @@ -1428,6 +1428,8 @@ 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 @@ -1438,7 +1440,6 @@ 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; } -- 2.25.1