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pstore/ram: Add check for kstrdup
author
Jiasheng Jiang
<jiasheng@iscas.ac.cn>
Wed, 14 Jun 2023 09:37:33 +0000
(17:37 +0800)
committer
Kees Cook
<keescook@chromium.org>
Wed, 14 Jun 2023 18:52:10 +0000
(11:52 -0700)
Add check for the return value of kstrdup() and return the error
if it fails in order to avoid NULL pointer dereference.
Fixes:
e163fdb3f7f8
("pstore/ram: Regularize prz label allocation lifetime")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link:
https://lore.kernel.org/r/20230614093733.36048-1-jiasheng@iscas.ac.cn
fs/pstore/ram_core.c
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diff --git
a/fs/pstore/ram_core.c
b/fs/pstore/ram_core.c
index
966191d
..
85aaf0f
100644
(file)
--- a/
fs/pstore/ram_core.c
+++ b/
fs/pstore/ram_core.c
@@
-599,6
+599,8
@@
struct persistent_ram_zone *persistent_ram_new(phys_addr_t start, size_t size,
raw_spin_lock_init(&prz->buffer_lock);
prz->flags = flags;
prz->label = kstrdup(label, GFP_KERNEL);
+ if (!prz->label)
+ goto err;
ret = persistent_ram_buffer_map(start, size, prz, memtype);
if (ret)