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| author | Jiasheng Jiang <jiasheng@iscas.ac.cn> | 2023-06-23 05:27:06 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-11-20 13:51:50 +0300 |
| commit | 63f637309baadf81a095f2653e3b807d4b5814b9 (patch) | |
| tree | 9dc0ed9213565d426818d3543685f402a6ab23e7 | |
| parent | 0a1dab4a8e3d0fc75629f547c7bba7060ec42905 (diff) | |
| download | linux-63f637309baadf81a095f2653e3b807d4b5814b9.tar.xz | |
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: 563ca40ddf40 ("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>
| -rw-r--r-- | fs/pstore/platform.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c index 0c034ea39954..7787fb544621 100644 --- a/fs/pstore/platform.c +++ b/fs/pstore/platform.c @@ -561,6 +561,8 @@ out: */ 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); |