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PCI: Fix reset_method_store() memory leak

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BugLink: https://bugs.launchpad.net/bugs/2101915

[ 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: d88f521da3 ("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>
CVE-2024-56745
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
This commit is contained in:
Todd Kjos
2025-03-11 08:51:19 +09:00
committed by Stefan Bader
parent c96fbecb84
commit ad90e82a0b
1 changed files with 3 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/pci/pci.c
+3 -2
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@@ -5452,7 +5452,7 @@ 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 };
@@ -5472,7 +5472,8 @@ 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;