pstore: ram_core: fix incorrect success return when vmap() fails

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[ Upstream commit 05363abc76 ]

In persistent_ram_vmap(), vmap() may return NULL on failure.

If offset is non-zero, adding offset_in_page(start) causes the function
to return a non-NULL pointer even though the mapping failed.
persistent_ram_buffer_map() therefore incorrectly returns success.

Subsequent access to prz->buffer may dereference an invalid address
and cause crashes.

Add proper NULL checking for vmap() failures.

Signed-off-by: Ruipeng Qi <ruipengqi3@gmail.com>
Link: https://patch.msgid.link/20260203020358.3315299-1-ruipengqi3@gmail.com
Signed-off-by: Kees Cook <kees@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Ruipeng Qi 2026-02-03 10:03:58 +08:00 • committed by Sasha Levin

parent d53d092019

commit 8d849adfbc

1 changed files with 7 additions and 0 deletions

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fs/pstore/ram_core.c

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