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pstore/ram: Add check for kstrdup 

Add check for the return value of kstrdup() and return the error
if it fails in order to avoid NULL pointer dereference.

Fixes: e163fdb3f7 ("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
This commit is contained in:
Jiasheng Jiang 2023-06-14 17:37:33 +08:00 committed by Kees Cook
parent 48f2c681df
commit d97038d5ec
1 changed files with 2 additions and 0 deletions
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2
fs/pstore/ram_core.c
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@ -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)