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f8a8dfdc41
[ Upstream commit 2ddb69f686ef7a621645e97fc7329c50edf5d0e5 ]
In persistent_ram_iomap(), ioremap() or ioremap_wc() may return NULL on
failure. Currently, if this happens, the function returns NULL without
releasing the memory region acquired by request_mem_region().
This leads to a resource leak where the memory region remains reserved
but unusable.
Additionally, the caller persistent_ram_buffer_map() handles NULL
correctly by returning -ENOMEM, but without this check, a NULL return
combined with request_mem_region() succeeding leaves resources in an
inconsistent state.
This is the ioremap() counterpart to commit 05363abc7625 ("pstore:
ram_core: fix incorrect success return when vmap() fails") which fixed
a similar issue in the vmap() path.
Fixes: 404a604338 ("staging: android: persistent_ram: handle reserving and mapping memory")
Signed-off-by: Cole Leavitt <cole@unwrap.rs>
Link: https://patch.msgid.link/20260225235406.11790-1-cole@unwrap.rs
Signed-off-by: Kees Cook <kees@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Ulrich Hecht <uli@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.