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pstore/platform: Add check for kstrdup 

[ Upstream commit a19d48f7c5d57c0f0405a7d4334d1d38fe9d3c1c ]

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

Fixes: 563ca40ddf ("pstore/platform: Switch pstore_info::name to const")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Link: https://lore.kernel.org/r/20230623022706.32125-1-jiasheng@iscas.ac.cn
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jiasheng Jiang 2023-06-23 10:27:06 +08:00 committed by Greg Kroah-Hartman
parent 0a1dab4a8e
commit 63f637309b
1 changed files with 8 additions and 1 deletions
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9
fs/pstore/platform.c
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@ -561,6 +561,8 @@ static int pstore_write_user_compat(struct pstore_record *record,
*/
int pstore_register(struct pstore_info *psi)
{
char *new_backend;
if (backend && strcmp(backend, psi->name)) {
pr_warn("ignoring unexpected backend '%s'\n", psi->name);
return -EPERM;
@ -580,11 +582,16 @@ int pstore_register(struct pstore_info *psi)
return -EINVAL;
}
new_backend = kstrdup(psi->name, GFP_KERNEL);
if (!new_backend)
return -ENOMEM;
mutex_lock(&psinfo_lock);
if (psinfo) {
pr_warn("backend '%s' already loaded: ignoring '%s'\n",
psinfo->name, psi->name);
mutex_unlock(&psinfo_lock);
kfree(new_backend);
return -EBUSY;
}
@ -617,7 +624,7 @@ int pstore_register(struct pstore_info *psi)
* Update the module parameter backend, so it is visible
* through /sys/module/pstore/parameters/backend
*/
backend = kstrdup(psi->name, GFP_KERNEL);
backend = new_backend;
pr_info("Registered %s as persistent store backend\n", psi->name);