5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Todd Kjos tkjos@google.com
[ Upstream commit 2985b1844f3f3447f2d938eff1ef6762592065a5 ]
In reset_method_store(), a string is allocated via kstrndup() and assigned to the local "options". options is then used in with strsep() to find spaces:
while ((name = strsep(&options, " ")) != NULL) {
If there are no remaining spaces, then options is set to NULL by strsep(), so the subsequent kfree(options) doesn't free the memory allocated via kstrndup().
Fix by using a separate tmp_options to iterate with strsep() so options is preserved.
Link: https://lore.kernel.org/r/20241001231147.3583649-1-tkjos@google.com Fixes: d88f521da3ef ("PCI: Allow userspace to query and set device reset mechanism") Signed-off-by: Todd Kjos tkjos@google.com Signed-off-by: Bjorn Helgaas bhelgaas@google.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/pci/pci.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index ee1d74f89a05f..09d1b69746602 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -5214,7 +5214,7 @@ static ssize_t reset_method_store(struct device *dev, const char *buf, size_t count) { struct pci_dev *pdev = to_pci_dev(dev); - char *options, *name; + char *options, *tmp_options, *name; int m, n; u8 reset_methods[PCI_NUM_RESET_METHODS] = { 0 };
@@ -5234,7 +5234,8 @@ static ssize_t reset_method_store(struct device *dev, return -ENOMEM;
n = 0; - while ((name = strsep(&options, " ")) != NULL) { + tmp_options = options; + while ((name = strsep(&tmp_options, " ")) != NULL) { if (sysfs_streq(name, "")) continue;