CVE-2022-50846

Summary

In the Linux kernel, the following vulnerability has been resolved:

mmc: via-sdmmc: fix return value check of mmc_add_host()

mmc_add_host() may return error, if we ignore its return value, it will lead two issues:

  1. The memory that allocated in mmc_alloc_host() is leaked.
  2. In the remove() path, mmc_remove_host() will be called to delete device, but it's not added yet, it will lead a kernel crash because of null-ptr-deref in device_del().

Fix this by checking the return value and goto error path which will call mmc_free_host().

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxf0bf7f61b8405224bc52fc9a3ccd167a68126e00 < 076bcd2c93e16b05c10564e299d6e5d26a766d00affected
LinuxLinuxf0bf7f61b8405224bc52fc9a3ccd167a68126e00 < 12b8e81b77c05c658efd9cde3585bbd65ae39b59affected
LinuxLinuxf0bf7f61b8405224bc52fc9a3ccd167a68126e00 < 95025a8dd0ec015872f6c16473fe04d6264e68caaffected
LinuxLinuxf0bf7f61b8405224bc52fc9a3ccd167a68126e00 < f59ef2a47a228e51322ad76752a55a8917c56e38affected
LinuxLinuxf0bf7f61b8405224bc52fc9a3ccd167a68126e00 < 63400da6cd37a9793c19bb6aed7131b58b975a04affected
LinuxLinuxf0bf7f61b8405224bc52fc9a3ccd167a68126e00 < 0959cc1685eb19774300d43ef25e318b457b156baffected
LinuxLinuxf0bf7f61b8405224bc52fc9a3ccd167a68126e00 < 0ec94795114edc7e24ec71849dce42bfa61dafa3affected
LinuxLinuxf0bf7f61b8405224bc52fc9a3ccd167a68126e00 < ba91b413983a9235792523c6b9f7ba2586c4d75daffected
LinuxLinuxf0bf7f61b8405224bc52fc9a3ccd167a68126e00 < e4e46fb61e3bb4628170810d3f2b996b709b90d9affected
LinuxLinux2.6.31affected
LinuxLinux0 < 2.6.31unaffected
LinuxLinux4.9.337 <= 4.9.*unaffected
LinuxLinux4.14.303 <= 4.14.*unaffected
LinuxLinux4.19.270 <= 4.19.*unaffected
LinuxLinux5.4.229 <= 5.4.*unaffected
LinuxLinux5.10.163 <= 5.10.*unaffected
LinuxLinux5.15.86 <= 5.15.*unaffected
LinuxLinux6.0.16 <= 6.0.*unaffected
LinuxLinux6.1.2 <= 6.1.*unaffected
LinuxLinux6.2 <= *unaffected

Weaknesses

References