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libalpm/discspace.c: ensure mount points provide directories

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In the very unlikely situtation where getmntent() and friends return
non-null, but the mount directory is NULL, a null dereference could
occur. It is unclear what the best course of action is in this case,
so just move on to the next mount point.

Signed-off-by: Allan McRae <allan@archlinux.org>
This commit is contained in:
Allan McRae 2024-01-26 20:27:20 +10:00
parent f996f30163
commit ce528a2654
1 changed files with 12 additions and 0 deletions
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12
lib/libalpm/diskspace.c
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@ -111,6 +111,10 @@ static alpm_list_t *mount_point_list(alpm_handle_t *handle)
}
while((mnt = getmntent(fp))) {
if(mnt->mnt_dir == NULL) {
continue;
}
CALLOC(mp, 1, sizeof(alpm_mountpoint_t), RET_ERR(handle, ALPM_ERR_MEMORY, NULL));
STRDUP(mp->mount_dir, mnt->mnt_dir, free(mp); RET_ERR(handle, ALPM_ERR_MEMORY, NULL));
mp->mount_dir_len = strlen(mp->mount_dir);
@ -134,6 +138,10 @@ static alpm_list_t *mount_point_list(alpm_handle_t *handle)
}
while((ret = getmntent(fp, &mnt)) == 0) {
if(mnt->mnt_mountp == NULL) {
continue;
}
CALLOC(mp, 1, sizeof(alpm_mountpoint_t), RET_ERR(handle, ALPM_ERR_MEMORY, NULL));
STRDUP(mp->mount_dir, mnt->mnt_mountp, free(mp); RET_ERR(handle, ALPM_ERR_MEMORY, NULL));
mp->mount_dir_len = strlen(mp->mount_dir);
@ -161,6 +169,10 @@ static alpm_list_t *mount_point_list(alpm_handle_t *handle)
}
for(; entries-- > 0; fsp++) {
if(fsp->f_mntonname == NULL) {
continue;
}
CALLOC(mp, 1, sizeof(alpm_mountpoint_t), RET_ERR(handle, ALPM_ERR_MEMORY, NULL));
STRDUP(mp->mount_dir, fsp->f_mntonname, free(mp); RET_ERR(handle, ALPM_ERR_MEMORY, NULL));
mp->mount_dir_len = strlen(mp->mount_dir);