From: Tuo Li islituo@gmail.com
[ Upstream commit 4b6012a7830b813799a7faf40daa02a837e0fd5b ]
kzalloc() is used to allocate memory for cd->detectors, and if it fails, channel_detector_exit() behind the label fail will be called: channel_detector_exit(dpd, cd);
In channel_detector_exit(), cd->detectors is dereferenced through: struct pri_detector *de = cd->detectors[i];
To fix this possible null-pointer dereference, check cd->detectors before the for loop to dereference cd->detectors.
Reported-by: TOTE Robot oslab@tsinghua.edu.cn Signed-off-by: Tuo Li islituo@gmail.com Signed-off-by: Kalle Valo kvalo@codeaurora.org Link: https://lore.kernel.org/r/20210805153854.154066-1-islituo@gmail.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/wireless/ath/dfs_pattern_detector.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/net/wireless/ath/dfs_pattern_detector.c b/drivers/net/wireless/ath/dfs_pattern_detector.c index a274eb0d19688..a0ad6e48a35b4 100644 --- a/drivers/net/wireless/ath/dfs_pattern_detector.c +++ b/drivers/net/wireless/ath/dfs_pattern_detector.c @@ -182,10 +182,12 @@ static void channel_detector_exit(struct dfs_pattern_detector *dpd, if (cd == NULL) return; list_del(&cd->head); - for (i = 0; i < dpd->num_radar_types; i++) { - struct pri_detector *de = cd->detectors[i]; - if (de != NULL) - de->exit(de); + if (cd->detectors) { + for (i = 0; i < dpd->num_radar_types; i++) { + struct pri_detector *de = cd->detectors[i]; + if (de != NULL) + de->exit(de); + } } kfree(cd->detectors); kfree(cd);