Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: spi: tegra210-quad: Protect curr_xfer check in IRQ handler Now that all other accesses to curr_xfer are done under the lock, protect the curr_xfer NULL check in tegra_qspi_isr_thread() with the spinlock. Without this protection, the following race can occur: CPU0 (ISR thread) CPU1 (timeout path) ---------------- ------------------- if (!tqspi->curr_xfer) // sees non-NULL spin_lock() tqspi->curr_xfer = NULL spin_unlock() handle_*_xfer() spin_lock() t = tqspi->curr_xfer // NULL! ... t->len ... // NULL dereference! With this patch, all curr_xfer accesses are now properly synchronized. Although all accesses to curr_xfer are done under the lock, in tegra_qspi_isr_thread() it checks for NULL, releases the lock and reacquires it later in handle_cpu_based_xfer()/handle_dma_based_xfer(). There is a potential for an update in between, which could cause a NULL pointer dereference. To handle this, add a NULL check inside the handlers after acquiring the lock. This ensures that if the timeout path has already cleared curr_xfer, the handler will safely return without dereferencing the NULL pointer.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected c934e40246da2c5726d14e94719c514e30840df8 before 513587caec66b67243027f26867ad3512f06744f; affected 551060efb156c50fe33799038ba8145418cfdeef before 84e926c1c272a35ddb9b86842d32fa833a60dfc7; affected 01bbf25c767219b14c3235bfa85906b8d2cb8fbc before 2ac3a105e51496147c0e44e49466eecfcc532d57; affected b4e002d8a7cee3b1d70efad0e222567f92a73000 before edf9088b6e1d6d88982db7eb5e736a0e4fbcc09e; affected 88db8bb7ed1bb474618acdf05ebd4f0758d244e2; affected 83309dd551cfd60a5a1a98d9cab19f435b44d46d; affected bb0c58be84f907285af45657c1d4847b960a12bf; affected 5.15.198 before 5.16; affected 6.1.160 before 6.2; affected 6.17.13 before 6.18 |
| Linux / Linux | affected 6.6.120 before 6.6.160; affected 6.12.63 before 6.12.80; affected 6.18.2 before 6.18.10 |
CWE
No CWE identifiers supplied.